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It is a little complex but the answer is yes, but generally not to the extreme of Windows. This is good and bad. Generally all programs will stay responsive, though slow down as load increases, but it also means that it is difficult to devote all resources to one thing, excluding all others.

For a more complex answer I would suggest invesigating OS X scheduling system and nice values. That is not light reading though.

EDIT: Thud beat me to it. Generally it is harder for a user space thread to pull all of the resources in OS X then windows. (Where a single program uses up all processing so that you can not even <ctrl><shift><esc> to kill the rogue process.) Crank a nice value high enough though (-20) and use up all the clock cycles and you would likely have a similar effect.
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