whats that command?

[N13X]

is there a dos command for creating new users?

[Dilbert]

No. :-/

[carlos]

Not in MS-DOS 6.22, but if you're running MS-DOS in Windows 2000 or XP
you can user the NET USER command:

C:\>net user /?

NET USER [user [passwd | *] [options]] [/DOMAIN]
         user {passwd | *} /ADD [options] [/DOMAIN]
         user [/DELETE] [/DOMAIN]

For example:

net user  topsecret  N13X /ADD