I need to clarify my explaination, as an admin you can create a computer account - sort of like staging - before the computer is joined. OR, the account is created at the time the computer is joined to the domain. If you "pre-stage" and not check the box, and should that computer be an NT machine, it would not be able to join the domain. Sorry, 9x clients aren't added in AD. So it would affect only NT clients.
Hewissa
MCSE, CCNA, CIW