Unlike its Windows 9x and Windows Me predecessors, Windows XP is built from the ground up to support multiple user accounts. XP requires each user to log on before using the computer so that it can apply the user's security privileges and desktop preferences and locate the user's personal files and folders (the user's profile).
When you sign on locally--which means you are physically at the keyboard of the machine--six possible scenarios exist:
You loaded this system on your own and this is the first boot, so you'll access the machine using the local Administrator account and password that you'd assigned during setup.
You've previously created usernames and passwords for this system, and you currently have the required ...