That person is probably using P4Web and when it refreshes the display the user is created again. You probably don't have protections setup.

If you do not have protections setup do the following, in order:

1. create two groups, one for admins (e.g. admins) , and one for everyone else (e.g. sweng). 2. Place yourself and other admins in the 'admin' group, place everyone else in the 'sweng' group. 2a. Verify the contents of the 'admin' and 'sweng' group. 3. Do p4 protect, using the following: list user * * -//... write group sweng * //... super group admins * //...

The first line prevents anybody from doing anything, this includes creating users and thus eating licenses (we used to have someone accessing Perforce as 'Administrator' from one WinNT workstation all the time...). The second line allows those people in group 'sweng' to do all the things they need to do (checkout for edit, submit, etc.). The third line gives the 'admin' group (which you better be part of!) super-user rights. If you for get this third line, you will have a BIG mess. Until you run the 'p4 protect' command, the groups have no meaning.