If you check this option, any files in your desktop directory that begin with a period (.) will be shown. Usually, such files contain configuration information, and remain hidden from view.
\nFor example, files which are named \".directory\" are plain text files which contain information for Konqueror, such as the icon to use in displaying a directory, the order in which files should be sorted, etc. You should not change or delete these files unless you know what you are doing.
This is the minimal distance (in pixels) between the icons on your desktop.
If this is enabled, you can change desktop icon spacing by pressing Ctrl and scrolling on the desktop background.