i am in the college at present but if i remeber right in the tweakUI provided by MS, its called Win+hotkey, though i m not sure. Also in tweakXP u might have disabled the WInkey altogether.
I found this on the net:
System Key: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
Value Name: Scancode Map
Data Type: REG_BINARY (Binary Value)
Value Data: 00 00 00 00 00 00 00 00 03 00 00 00 00 00 5B E0 00 00 5C E0 00 00 00 00
u might have to make a new binary key for ScanCode Map.
For hotkey: check out this link:
*www.winguides.com/registry/display.php/549
Gotta go now, will try to help more wen i reach home, if prob not solved.