document: Windows XP fast user switching The Windows NT family of operating systems has always supported the concept of multiple user accounts , but they 've taken the concept a step further with Windows XP 's Fast User Switching feature . Fast User Switching is a new feature of Windows XP that allows multiple users to log on to the same machine and quickly switch between the logged on accounts . Fast User Switching is implemented using some of the built-in capabilities of Terminal Services . Terminal Server has been around for a while but is much more feature rich and integrated in Windows XP . A machine with the terminal services -LRB- Remote Desktop -RRB- client can log on to and run applications on a remote machine running the terminal server
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