From Blue Lakes Technology:
Instantly hides all web browser or other windows with a push of a button. Just press Ctrl + Space and all of your private windows will disappear from your screen and Window's taskbar. Press Ctrl + Space to make your private windows reappear. You may use it to instantly hide any program's window, including: Internet Explorer Yahoo, AOL or MSN Messenger Firefox Gmail Chat Windows Media Player You may also choose which Hot Keys control The Boss Button.