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
sudo killall application_name
You can also just use kill. Find which PID your progam has
then kill it by typing
sudo kill PIDnr
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.