Ok. So. My computer's got an Intel Centrino Duo processer. 1.83 ghz each. My problem is, though, that whenever I'm running a game or something like that, I've noticed the CPU usage never goes over 50%, something I'm taking to mean that the games are only working off of one processor, even though I have them all set to use both under the affinity settings in the task manager.

So my question is as follows, and is in multiple parts:

A) Are they really only using one core? Or is it just limiting the amount of CPU usage it can do?
B) If they are only using one processor, is there any way I can force them to use both, to get better performance?
C) Would a game using more than 50% of the CPU power necessarily make it run better?