Dual Monitors?

So, im thinking of hooking up dual monitors for my computer… nothing spectacular or anything, i just want a smaller lcd for Palettes in Photoshop and After Effects and such. My question is this:

If my main 20" widescreen Dell monitor is running at 1600x1250 res, than does the second monitor have to run/support this res to run right? or would i have to dumb down my main res on the 20" to match the little secondary monitor?

Hope that makes sense… thanks in advance for the help.1

You can set each monitor to what ever res you want.

Assuming Windows XP, this is true. Under previous OS’s it was not…