There are too many if them. Common used ones are Guest, User, Power User, Backup Operator, Administrator ans so on.
Windows XP doesn't have a (published) finite limit on the number of accounts that can be created. You should be able to create as many accounts as you have hard drive space for.
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The administrator of the Windows XP can set up new accounts or deny users from setting up accounts.
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This is for xp::start>control panel>user accounts>create new account
Without knowing what operating system you are using we may not be able to describe this accurately. Windows XP - Start Menu - Settings - Control Panel - User Accounts - Create New Account
Administrative, Standard, Power, Guest, and for a Bonus: Restricted. administrator, power user, limited user (also called the users group), and guest accounts. Other user groups exist and you can create your own user groups.
Start->Control Panel->User Accounts->Create a new account
As administrator, you can create unique 'user accounts'.
Yes. Click 'start' click 'My Computer' click 'Control Panel' click 'User Accounts'. There you go ;)
Of course, if you do not have a connection to a network, you cannot use network accounts; so the only thing remaining are local accounts. These can be created in the User Accounts applet in Control Panel, if you have sufficient permissions.
ADMINISTRATOR and GUEST accounts, though the GUEST account is disabled by default in XP Home and XP Prof.