Remove and restrict access to XP taskbar tray icons
You can remove and restrict access to the tray icons (next to the clock on the
taskbar) using the following Windows XP registry hack:
Hive: HKEY_CURRENT_USER
Key: Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Name: NoTrayItemsDisplay
Type: REG_DWORD
Value: 0
default
Value: 1 enable
restriction