Loggarsi come Administrator in WinXP

Estratto da questo link http://windowsxp.mvps.org/admins.htm

How to login as Administrator in Windows XP?
The built-in Administrator account is hidden from Welcome Screen when a user account with Administrator privileges exists and enabled. In Windows XP Home Edition, you can login as built-in Administrator in Safe Mode only. For XP Professional, press CTRL + ALT + DEL twice at the Welcome Screen and input your Administrator password in the classic logon window that appears.