This hack will take you to a Win2k login style screen when you are at the welcome screen. This is very useful since WinXP Pro, by default, hides the Administrator account if you have any other user accounts.
When you are at the Welcome Screen, press CTRL+ALT+DEL two times and that will take you to the Win2k style login screen. From here you can log in as administrator or any other user on the system. This little trick can help you make your machine super secure. Check out some of the other hacks on how to hide user accounts from the Welcome Screen. Do that and then you will have to get to the Win2k login screen in order to get into your machine. Ultimate situation if you don't want anybody loggin into your machine!!!