NT4

Menu Show Delay. Default Delay is 400.

Regedit4
[HKEY_Current_User\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
"MenuShowDelay"="400"

Allow to hide last logon user from logon screen.

Value: DontDisplayLastUserName
Type: REG_DWORD

Windows 2000 and newer

HKEY: HKLM
Key: SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

Windows NT4

HKEY: HKLM
Key: SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

Windows 9x/Me

Allows you to disable desktop icons.