How can I split an external monitor's screen on MacBook Pro

I have a MacBook Pro with TWO external monitors.  When maximizing a program on one of the external monitors it expands across BOTH screens. When I do the same thing on my Windows 7 system the program is contained to the monitor it is being displayed on. (Pretty smart of that PC to know which monitor I'm working on!) So HOW can I get the Mac to do the same thing? Is there a 3rd party utility that can identify multiple monitors?  I'm using a Matrix DualHead2Go to connect the two external montors to the Mini-DVI port on the Mac.
Thanks!!

I'm using a Matrix DualHead2Go to connect the two external montors to the Mini-DVI port on the Mac
The behavior you describe in Windows is exactly how much multiple display system works but I have two graphics cards capable of driving two displays each. I believe you have identified the problem in the above sentence. I believe that the Mac sees the Matrix device as a single display and not the two displays themselves. With the two external monitors attached, open System Preferences and select the Displays tab. If the Mac OS sees the displays as two separate displays you should see a dialog in each of the monitors and on your MacBook Pro. If I am correct you won't see three display dialogs, you'll only see two, one on the Mac and one on one of the two external displays.

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