<para>For &UNIX; operating systems there are often different users, which in turn might have different privileges. The conventional method is to have an ordinary user account, whose files are generally stored in <filename>/home/username</filename>, and then to also have a <systemitem class="username">root</systemitem> account. The <systemitem class="username">root</systemitem>, or Super User, account has system-wide privileges, being able to modify any file on the system. </para>
<para>Although this means that it is easy to perform administrative tasks without hassle, it also means that there are no security restrictions imposed upon it. Thus, a small typographical error or other mistake can result in irrevocable damage.</para>
<para>Some of the operating systems that run &kde; come with a graphical <systemitem class="username">root</systemitem> login enabled. Despite this, you should never log in to &kde; as <systemitem class="username">root</systemitem>, and you should never need to. Your system is far more open to attack, particularly if you are browsing the Internet as <systemitem class="username">root</systemitem>, and you dramatically increase your chances of damaging your system.</para>
<para>Some &Linux; distributions have tried to stress this point so much that they have disabled the <systemitem class="username">root</systemitem> account altogether, and instead use the <command>sudo</command> model. Nevertheless, the basic security model in <command>sudo</command> is the same as <command>su</command>, and thus they share the same security strengths and weaknesses, essentially.</para>
<para>If you should ever need to run a program with Super User privileges, then it is always recommend that you use &tdesu;. From &konsole; or from hitting <keycombo action="simul">&Alt;<keycap>F2</keycap></keycombo>, enter <userinput>tdesu <replaceable>application</replaceable></userinput>, and the application will be run with the appropriate Super User privileges. </para>
<para>Even if you have set up your system to use <command>sudo</command>, or you are on a distribution that uses <command>sudo</command>, such as &kubuntu;, you should still use &tdesu;. The program will be appropriately modified by the developers to use the correct settings. You should not, however, ever use <command>sudo <replaceable>application</replaceable></command> to run an application with <systemitem class="username">root</systemitem> permissions; it can derange permissions of certain configuration files for a program. Running a graphical applications as <systemitem class="username">root</systemitem> in general is not a good idea, but using &tdesu; will always be your safest bet with it.</para>
