Connect to two wireless networks at once?

[byunews]

Hi. Do any of you know how to connect to two wireless networks at once in Windows XP SP2? I set two to "automatic" and tell Windows to "automatically connect to non-preferred networks", but as soon as one connects the other drops out. Windows won't connect to both at a time.
Any ideas?

[GroundZero3]

if you have one wireless card, you can only access one wireless network at a time