http://www.kms.ch/de/images/windowstaste.jpg
Some people would prefer to have this key disabled, here's how:
1. Start the Registry Editor 2. Go to HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Control Keyboard Layout 3. From the Edit menu select New > Binary value 4. Give this new value the name Scancode Map 5. Double-click the new value, and enter the following binary data (0 = zero): 00 00 00 00 00 00 00 00 03 00 00 00 00 00 5B E0 00 00 5C E0 00 00 00 00 6. Close the registry editor 7. Log off, or restart Windows for the changes to take effect
Note: This is a system wide setting, so it will affect all users on the system!