Not sure what you are getting at. Admin & standard user accounts have been available since Windows NT4. Windows XP is based on Win2000, which is based on Win NT4.
I have my parents on a limited user account, because my father has a tendency to click ok, ok, ok, ok to everything, without reading the popup message, and that's win xp. If they need this install any programs, a popup demands an admin account name and password to continue.
It stops most problems.
There' s not much I can do about him unplugging every power, phone, network, usb and video cable and then not knowing where everything goes . Rotflmao.