Here are some of the main features:
Shut down the computer (log off and shut down the system).
Restart the computer (log off and restart the system).
Lock screen (screen lock uses screen saver).
End of current session (ends current KDE session and logs out the user).
Tidbits (additional, external user commands).
Time and delay options.
Command line and DCOP support.
System tray icons and panel programs.
Visual and audio notifications.
KDE commissary support.
it works
it works
it works