change affinity of multiple processes without going to task manager

Is there a way to change the affinity of multiple processes without having to go through the process list in the task manager? I'm trying to reserve a processor for running games on.

I dont think it is possible to automatically set the processor affinity. There are no pograms for such as it will not know what to put on what processor and not know how to handle a third window. By the time if any software exists i will surely try to let you know about same, however, i cant understand whats so difficult in doing it manually?