We can't think of a really good use for this one, and it's just for fun that we're including it here. We all use the System Tray in the Taskbar, but you can get prevent any items from appearing there - except the time, if you've set the clock to appear in the System Tray! So once you apply this hack, the System Tray will be blank except for the time.
Navigate to:
HCU\Software\Microsoft\Windows\
CurrentVersion\Policies\Explorer
And to:
HLM\Software\Microsoft\Windows
\CurrentVersion\Policies\Explorer
Create a DWORD Value in both locations called NoTrayItemsDisplay. Set it to 1 to make items in the System Tray vanish. Come to think of it, this is a cool prank hack! Just log out and back on for the change to take effect.
