Move window from second screen to the main when the second screen is not visible

I use a VPN and Windows remote desktop to log onto my Windows XP work computer from my Win Vista 64 home computer.

The only problem is that I sometimes forget to move all my important windows over to the main screen when I leave work. Does anyone know a way I can move the windows over to the main window without being able to see them?

So far the only way I know how to do this is by closing them and reopening, which is not an option for tests that has been running for multiple hours.