In windows you can close any program at any time with CTRL+ALT+Delete.
This combination does not work in Pardus, and alltough Pardus is as stable as steel, sometimes a program just freezes.
To close this program press: CTRL+ALT+Esc, and a skull will appear as cursor, with this you can close any window you choose, for sure! Just click on the window that you want to terminate!
Also you can kill a program on the console by giving the command in Terminal <pre> sudo killall application_name </pre>
You can also just use kill. Find which PID your progam has <pre>ps -aux</pre> then kill it by typing <pre>sudo kill PIDnr</pre>
KDE Process Table
Only working in KDE. It's almost like the Task Manager in Windows. Try Ctrl + Esc to open the ProcessTable or press Ctrl+Alt+Esc. When the cursor is skull based click on the program you want to kill.