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@ -1,5 +1,5 @@
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x11vnc README file Date: Tue Apr 19 16:26:20 EDT 2005
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x11vnc README file Date: Mon May 2 21:41:13 EDT 2005
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The following information is taken from these URLs:
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@ -527,7 +527,9 @@ make
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Here is what is shaping up to be [52]the release notes for 0.7.2..
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Note that the [53]X DAMAGE feature will be on by default and so I am
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interested if that causes any problems. Thanks!
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interested if that causes any problems. I'd also like to have the new
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"wireframe" move/resize stuff on by default as well, let me know of
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any issues you find. Thanks!
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_________________________________________________________________
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Some Notes:
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@ -576,11 +578,10 @@ make
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note below)
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Options: x11vnc has (far too) many features that may be activated
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via its [57]command line options. Useful options are -nap to use fewer
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resources (it sleeps more between polls when activity is low) and
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-rfbauth passwd-file to use VNC password protection (the vncpasswd or
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storepasswd programs, or the x11vnc [58]-storepasswd option can be
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used to create the password file).
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via its [57]command line options. Useful options are, e.g., -scale to
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do server-side scaling, and -rfbauth passwd-file to use VNC password
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protection (the vncpasswd or storepasswd programs, or the x11vnc
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[58]-storepasswd option can be used to create the password file).
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Algorithm: How does x11vnc do it? Rather brute-forcedly: it
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continuously polls the X11 framebuffer for changes using
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@ -588,18 +589,18 @@ make
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which rectangular regions of the framebuffer have changed, and
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libvncserver compresses the changes and sends them off to any
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connected VNC viewers. A number of applications do similar things,
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such as x0rfbserver, krfb, x0vncserver. x11vnc uses a 32 x 32 pixel
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tile model (the desktop is decomposed into roughly 1000 such tiles),
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where changed tiles are found by pseudo-randomly polling 1 pixel tall
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horizontal scanlines. This is a surprisingly effective algorithm for
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finding changed regions. For keyboard and mouse user input the XTEST
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extension is used to pass the input events to the X server. To detect
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XBell "beeps" the XKEYBOARD extension is used. If available, the
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XFIXES extension is used to retrieve the current mouse cursor shape.
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Also, if available the X DAMAGE extension is used to receive hints
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from the X server where modified regions on the screen are. This
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greatly reduces the system load when not much is changing on the
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screen and also improves how quickly the screen is updated.
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such as x0rfbserver, krfb, x0vncserver, vino. x11vnc uses a 32 x 32
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pixel tile model (the desktop is decomposed into roughly 1000 such
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tiles), where changed tiles are found by pseudo-randomly polling 1
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pixel tall horizontal scanlines. This is a surprisingly effective
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algorithm for finding changed regions. For keyboard and mouse user
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input the XTEST extension is used to pass the input events to the X
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server. To detect XBell "beeps" the XKEYBOARD extension is used. If
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available, the XFIXES extension is used to retrieve the current mouse
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cursor shape. Also, if available the X DAMAGE extension is used to
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receive hints from the X server where modified regions on the screen
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are. This greatly reduces the system load when not much is changing on
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the screen and also improves how quickly the screen is updated.
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Barbershop mirrors effect: What if x11vnc is started up, and
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vncviewer is then started up on the same machine and displayed on the
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@ -1375,7 +1376,9 @@ display :0
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unintendeds. Perhaps this is of use in remote access for an embedded
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application, etc...
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Let us know if more build-time customizations would be useful.
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Let us know if more build-time customizations would be useful. Look
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near the top of the source file for any additional customization
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macros.
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If the system does not have the XTEST XTestGrabControl interface (some
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early X11R5 systems have XTEST but not this interface), then configure
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@ -2761,18 +2764,20 @@ ied)
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polling and updates will be suspended and only an animated "wireframe"
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(a rectangle outline drawn where the moved/resized window would be) is
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shown. When the window move/resize stops, it returns to normal
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processing: you should just see the window appear in the new position.
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This spares you from interacting with a "lurching" window during all
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of the intermediate steps. (the lurching is due to [297]slow video
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card read rates)
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The mode is currently on be default because most people are inflicted
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processing: you should only see the window appear in the new position.
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This spares you from interacting with a "lurching" window between all
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of the intermediate steps. BTW the lurching is due to [297]slow video
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card read rates. A displacement, even a small one, of a large window
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requires a non-negligible amount of time, a good fraction of a second,
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to read in from the hardware framebuffer.
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The mode is currently on by default because most people are inflicted
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with the problem. It can be disabled with the [298]-nowireframe
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option. Why might one want to turn off the wireframing? Since x11vnc
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is merely guessing when windows are being moved/resized, it may guess
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poorly for your window-manager or desktop, or even for the way you
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move the pointer. If your window-manager or desktop already does its
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own wireframing then this mode is a waste of time or could do the
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own wireframing then this mode is a waste of time and could do the
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wrong thing occasionally. There may be other reasons the new mode
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feels unnatural. If you have very expensive video hardware (SGI) or
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are using an in-RAM video framebuffer (SunRay, ShadowFB, Xvfb), the
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@ -2785,16 +2790,16 @@ ied)
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are not fool proof: x11vnc is sometimes tricked and so you'll
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occasionally see the lurching opaque move and rarely something even
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worse. First it assumes that the move/resize will occur with a mouse
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button pressed and held down (of course this is only mostly true).
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Next it will only consider a window for wireframing if the mouse
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pointer is initially "close enough" to the edges of the window frame,
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e.g. you have grabbed the title bar or a resizer edge (this
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button pressed, held down and dragged (of course this is only mostly
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true). Next it will only consider a window for wireframing if the
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mouse pointer is initially "close enough" to the edges of the window
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frame, e.g. you have grabbed the title bar or a resizer edge (this
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requirement can be disabled). If these are true, it will wait an
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amount of time to see if the window starts moving or resizing. If it
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does, it starts drawing the wireframe "animation" of where the window
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would be. If the mouse button is released, or a timeout occurs, it
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goes back to the standard mode to allow the framebuffer changes to
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propagate to the viewers.
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does, it starts drawing the wireframe "outline" of where the window
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would be. When the mouse button is released, or a timeout occurs, it
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goes back to the standard mode to allow the actual framebuffer changes
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to propagate to the viewers.
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These parameters can be tweaked:
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* Color/Shade of the wireframe.
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@ -2836,6 +2841,12 @@ ied)
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data is translated! Use -nowirecopyrect if this yields undesirable
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effects for your desktop.
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Also, the CopyRect encoding may give incorrect results under -scale
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(depending on the scale factor the CopyRect operation is often only
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approximate: the correctly scaled framebuffer will be slightly
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different from the translated one). Use -nowirecopyrect if this or
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other painting errors are unacceptable.
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Q-51: Does x11vnc support the X DAMAGE Xserver extension to find
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modified regions of the screen quickly and efficiently?
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@ -4222,7 +4233,7 @@ x11vnc: a VNC server for real X displays
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Here are all of x11vnc command line options:
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% x11vnc -opts (see below for -help long descriptions)
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x11vnc: allow VNC connections to real X11 displays. 0.7.2 lastmod: 2005-04-19
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x11vnc: allow VNC connections to real X11 displays. 0.7.2 lastmod: 2005-05-02
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x11vnc options:
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-display disp -auth file
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@ -4266,21 +4277,23 @@ x11vnc options:
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-xwarppointer -buttonmap string
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-nodragging -wireframe [str]
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-nowireframe -wirecopyrect mode
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-nowirecopyrect -pointer_mode n
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-input_skip n -speeds rd,bw,lat
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-debug_pointer -debug_keyboard
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-defer time -wait time
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-nap -nonap
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-sb time -noxdamage
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-xd_area A -xd_mem f
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-sigpipe string -threads
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-nothreads -fs f
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-gaps n -grow n
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-fuzz n -snapfb
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-rawfb string -pipeinput cmd
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-gui [gui-opts] -remote command
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-query variable -sync
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-noremote -unsafe
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-nowirecopyrect -scrollcopyrect mode
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-noscrollcopyrect -scr_area n
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-pointer_mode n -input_skip n
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-speeds rd,bw,lat -debug_pointer
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-debug_keyboard -defer time
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-wait time -nap
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-nonap -sb time
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-noxdamage -xd_area A
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-xd_mem f -sigpipe string
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-threads -nothreads
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-fs f -gaps n
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-grow n -fuzz n
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-snapfb -rawfb string
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-pipeinput cmd -gui [gui-opts]
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-remote command -query variable
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-sync -noremote
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-yesremote -unsafe
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-safer -privremote
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-nocmds -deny_all
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@ -4309,7 +4322,7 @@ libvncserver options:
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% x11vnc -help
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x11vnc: allow VNC connections to real X11 displays. 0.7.2 lastmod: 2005-04-19
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x11vnc: allow VNC connections to real X11 displays. 0.7.2 lastmod: 2005-05-02
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Typical usage is:
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@ -5009,13 +5022,16 @@ Options:
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heuristics and may not always work: it depends on your
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window manager and even how you move things around.
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See -pointer_mode below for discussion of the "bogging
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down" problem this tries to avoid. Default: -wireframe
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down" problem this tries to avoid.
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Default: -wireframe
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Shorter aliases: -wf [str] and -nowf
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The value "str" is optional and, of course, is
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packed with many tunable parameters for this scheme:
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Format: shade,linewidth,percent,T+B+L+R,t1+t2+t3+t4
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Default: 0xff,3,0,32+8+8+8,0.15+0.35+4.0+0.1
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Default: 0xff,3,0,32+8+8+8,0.15+0.30+5.0+0.125
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If you leave nothing between commas: ",," the default
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value is used. If you don't specify enough commas,
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@ -5047,16 +5063,67 @@ Options:
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link this might be a better choice: 0.25+0.6+6.0+0.15
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-wirecopyrect mode Since the -wireframe mechanism evidently tracks moving
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-nowirecopyrect windows, a speedup can be obtained by telling the VNC
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viewers to locally copy the translated window region.
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This is the VNC CopyRect encoding: the framebuffer
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update doesn't need to send the actual new image data.
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-nowirecopyrect windows accurately, a speedup can be obtained by
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telling the VNC viewers to locally copy the translated
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window region. This is the VNC CopyRect encoding:
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the framebuffer update doesn't need to send the actual
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new image data.
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Shorter aliases: -wcr [mode] and -nowcr
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"mode" can be "never" (same as -nowirecopyrect)
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to never try the copyrect, "top" means only do it if
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the window was not covered by any other windows, and
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"always" means to translate the orginally unobscured
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region (this may look odd as the remaining pieces come
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in, but helps on a slow link) Default: always
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in, but helps on a slow link). Default: "always"
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Note: there can be painting errors when using -scale
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so CopyRect is skipped when scaling unless you specify
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-wirecopyrect on the command line or by remote-control.
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-scrollcopyrect mode Like -wirecopyrect, but use heuristics to try to guess
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-noscrollcopyrect if a window has scrolled its contents (either vertically
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or horizontally). This requires the RECORD X extension
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to "snoop" on X applications (currently for certain
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XCopyArea and XConfigureWindow X protocol requests).
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Examples: Hitting <Return> in a terminal window when the
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cursor was at the bottom, the text scrolls up one line.
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Hitting <Down> arrow in a web browser window, the web
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page scrolls up a small amount.
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Shorter aliases: -scr [mode] and -noscr
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This scheme will not always detect scrolls, but when
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it does there is a nice speedup from using the VNC
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CopyRect encoding (see -wirecopyrect). The speedup
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is both in reduced network traffic and reduced X
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framebuffer polling/copying. On the other hand,
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it may induce undesired transients (e.g. a terminal
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cursor being scrolled up when it should not be) or other
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painting errors. These are automatically repaired in a
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short period of time. If this is unacceptable disable
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the feature with -noscrollcopyrect.
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"mode" can be "never" (same as -noscrollcopyrect)
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to never try the copyrect, "keys" means to try it
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in response to keystrokes only, "mouse" means to
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try it in response to mouse events only, "always"
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means to do both. Default: "always"
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Note: there can be painting errors when using
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-scale so CopyRect is skipped when scaling unless
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you specify -scrollcopyrect on the command line or
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by remote-control.
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-scr_area n Set the minimum area in pixels for a rectangle
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to be considered for the -scrollcopyrect detection
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scheme. This is to avoid wasting the effort on small
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rectangles that would be quickly updated the normal way.
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E.g. suppose an app updated the position of its skinny
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scrollbar first and then shifted the large panel
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it controlled. We want to be sure to skip the small
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scrollbar and get the large panel. Default: 60000
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-pointer_mode n Various pointer motion update schemes. "-pm" is
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an alias. The problem is pointer motion can cause
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@ -5503,11 +5570,16 @@ Options:
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buttonmap:str set -buttonmap "str", empty to disable
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dragging disable -nodragging mode.
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nodragging enable -nodragging mode.
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wireframe enable -wireframe mode.
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nowireframe disable -wireframe mode.
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wireframe enable -wireframe mode. same as "wf"
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nowireframe disable -wireframe mode. same as "nowf"
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wireframe:str enable -wireframe mode string.
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wireframe_mode:str enable -wireframe mode string.
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wirecopyrect:str set -wirecopyrect string.
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wirecopyrect:str set -wirecopyrect string. same as "wcr:
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"
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scrollcopyrect:str set -scrollcopyrect string. same "scr
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"
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noscrollcopyrect disable -scrollcopyrect mode. "noscr"
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scr_area:n set -scr_area to n
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pointer_mode:n set -pointer_mode to n. same as "pm"
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input_skip:n set -input_skip to n.
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speeds:str set -speeds to str.
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@ -5550,6 +5622,15 @@ Options:
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dontdisconnect enable -dontdisconnect mode.
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nodontdisconnect disable -dontdisconnect mode.
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(may interfere with other options)
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debug_xevents enable debugging X events.
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nodebug_xevents disable debugging X events.
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debug_xdamage enable debugging X DAMAGE mechanism.
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nodebug_xdamage disable debugging X DAMAGE mechanism.
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debug_wireframe enable debugging wireframe mechanism.
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nodebug_wireframe disable debugging wireframe mechanism.
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debug_scroll enable debugging scrollcopy mechanism.
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nodebug_scroll disable debugging scrollcopy mechanism.
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noremote disable the -remote command processing,
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it cannot be turned back on.
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@ -5606,13 +5687,14 @@ Options:
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add_keysyms noadd_keysyms clear_mods noclear_mods
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clear_keys noclear_keys remap repeat norepeat
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fb nofb bell nobell sel nosel primary noprimary
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cursorshape nocursorshape cursorpos nocursorpos
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cursor show_cursor noshow_cursor nocursor arrow
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xfixes noxfixes xdamage noxdamage xd_area xd_mem
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alphacut alphafrac alpharemove noalpharemove alphablend
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noalphablend xwarp xwarppointer noxwarp noxwarppointer
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buttonmap dragging nodragging wireframe_mode
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wireframe nowireframe wirecopyrect nowirecopyrect
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cursorshape nocursorshape cursorpos nocursorpos cursor
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show_cursor noshow_cursor nocursor arrow xfixes noxfixes
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xdamage noxdamage xd_area xd_mem alphacut alphafrac
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alpharemove noalpharemove alphablend noalphablend
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xwarp xwarppointer noxwarp noxwarppointer buttonmap
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dragging nodragging wireframe_mode wireframe wf
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nowireframe nowf wirecopyrect wcr nowirecopyrect nowcr
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scr_area scrollcopyrect scr noscrollcopyrect noscr
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pointer_mode pm input_skip input client_input speeds
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debug_pointer dp nodebug_pointer nodp debug_keyboard dk
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nodebug_keyboard nodk deferupdate defer wait rfbwait
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@ -5622,19 +5704,23 @@ Options:
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noalwaysshared nevershared noalwaysshared dontdisconnect
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nodontdisconnect desktop noremote
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aro= debug_xevents debug_xdamage display vncdisplay
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desktopname http_url auth users rootshift clipshift
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scale_str scaled_x scaled_y scale_numer scale_denom
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scale_fac scaling_blend scaling_nomult4 scaling_pad
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scaling_interpolate inetd privremote unsafe safer
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nocmds passwdfile using_shm logfile o flag rc norc h
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help V version lastmod bg sigpipe threads pipeinput
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clients client_count pid ext_xtest ext_xtrap ext_xkb
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ext_xshm ext_xinerama ext_overlay ext_xfixes ext_xdamage
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ext_xrandr rootwin num_buttons button_mask mouse_x
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mouse_y bpp depth indexed_color dpy_x dpy_y wdpy_x
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wdpy_y off_x off_y cdpy_x cdpy_y coff_x coff_y rfbauth
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passwd
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aro= debug_xevents nodebug_xevents debug_xevents
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debug_xdamage nodebug_xdamage debug_xdamage
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debug_wireframe nodebug_wireframe debug_wireframe
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debug_scroll nodebug_scroll debug_scroll display
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vncdisplay desktopname http_url auth users rootshift
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clipshift scale_str scaled_x scaled_y scale_numer
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scale_denom scale_fac scaling_blend scaling_nomult4
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scaling_pad scaling_interpolate inetd privremote
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unsafe safer nocmds passwdfile using_shm logfile
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o flag rc norc h help V version lastmod bg sigpipe
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threads readrate netrate netlatency pipeinput clients
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client_count pid ext_xtest ext_xtrap ext_xrecord
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ext_xkb ext_xshm ext_xinerama ext_overlay ext_xfixes
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ext_xdamage ext_xrandr rootwin num_buttons button_mask
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mouse_x mouse_y bpp depth indexed_color dpy_x dpy_y
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wdpy_x wdpy_y off_x off_y cdpy_x cdpy_y coff_x coff_y
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rfbauth passwd
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-sync By default -remote commands are run asynchronously, that
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is, the request is posted and the program immediately
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@ -5656,6 +5742,8 @@ Options:
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taken place.
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-noremote Do not process any remote control commands or queries.
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-yesremote Do process remote control commands or queries.
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Default: -yesremote
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A note about security wrt remote control commands.
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If someone can connect to the X display and change
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@ -5685,10 +5773,10 @@ Options:
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-safer Equivalent to: -novncconnect -noremote and prohibiting
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-gui and the -connect file. Shuts off communcation
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channels.
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-privremote Perform some sanity checks and only allow remote-control
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-privremote Perform some sanity checks and disable remote-control
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commands if it appears that the X DISPLAY and/or
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connectfile cannot be accessed by other users. (not
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complete, does not check for empty access control list)
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connectfile can be accessed by other users. Once
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remote-control is disabled it cannot be turned back on.
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-nocmds No external commands (e.g. system(3), popen(3), exec(3))
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will be run.
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runge
20 years ago