On Windows XP Professional computers, when they are a member of a workgroup, you have the option of using the new, "friendly logon" interface as opposed to the classic Windows logon interface.

After you have added a second user that also has administrative privileges, the built-in Administrator account does no longer appear during the friendly logon sequence.

Here’s a little trick that will allow you to logon with the built-in Administrator account:

• Press the CTRL+ALT+DELETE key combination twice during the friendly logon interface and you will be presented with the conventional Windows 2000 logon interface.