The image above is the nice login screen you get with windows XP Home or Windows XP Professional edition with fast user switching enabled. Fast user switching is usually enabled by default on windows XP but if it is not it can be enabled again.
When windows XP Professional computer is a member of a domain, fast user switching is disabled.
Fast user switching cannot be enabled when the computer is a member of the domain. Windows XP Home cannot be a member of a domain, only workgroup.