[kubuntu] temporarily stop application?

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http://ubuntuforums.org – Hello All, I don't find this on my cheat list... I want to know how to temporarily stop/freeze/interrupt/halt an application for which I know the PID, using a terminal command - BUT NOT kill/terminate it. Then of course I need a command to resume. I googled around some, but either I am not using the right terms to search or I just can't find a solution out there. I'm pretty sure this is dirt-simple for somebody. Thanks! CT (Hardware)