How do you create a hidden user?

Login Window only looks at users whose UID is above 500, so in order to do this, you need to create a user whose UID is below 500. Here is how I would do it:

1) Create a new user with admin privileges in System Preferences the same as you normally would
2) Open up NetInfo Manager and click on "users" in the left column
3) Change the uid value of the new user to something like 490.

That should do it, I think...

 

It's not a UNIX issue. It's a Mac issue, Login Window is the Mac program you'll need to affect. Perhaps someone here can explain if there is a method of keeping Login Window from displaying a particular name in the list. I doubt it'd be worth the trouble. I guess the question is why are you trying to do this, why not just go to "name and password"? It's not especially difficult to remember usernames...

edit: Of course alex is right, hadn't thought of that... as long as OS X doesn't mind you using a custom account number.