DCOP: Scripting the KDE Desktop

KDE provides a powerful interprocess communication system in DCOP, the Desktop COmmunication Protocol. Using DCOP, you can control a wide range of functions in KDE from the command line or from a script written in your favorite scripting language. You can also get information out of KDE applications: for example, several KDE media players provide methods to query the player for information about the currently-playing track.

For the whole Artical can be seen HERE

I found this when I was trying to write a script that will change my desktop to the Daily comic strip Dilbert automatically
Then I found the DCOP command
Example
#dcop kdesktop KBackgroundIface setWallpaper /tmp/dilbert.gif 1

The Above command will change your desktop wallpaper to /tmp/dilbert.gif

If any one interested to see the script the script is at link given bellow
python script source code