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1.
1. To provide difficulty to ones computer to the point where it is running at full capacity.

2. To complete consecutive tasks or quests in an online game to power level or just to complete.
I. Crisis 2 on max settings is really tasking my computer...

II. Was tasking all night to get to level 80, I don't even think I slept!
by Wreckard July 01, 2014