Windows 7 has a cool new feature that should help. Click the icon in the taskbar to ensure that the program has focus. Then hold down the Windows key and press the right-arrow a few times. That should move the window across your screens and eventually bring it back onto the screen that is still active.
Senior Technical Writer
Windows Server Networking User Assistance
Thanks, Dave. I’d lost the Yammer client for weeks. Kept getting notifications, but had to open a browser to follow.