Theoretically yes they should but you may want to do this after hours
if possible.

"Dave" <Dave@discussions.microsoft.com> wrote in message news:.
> We have a WinNT 4.0 domain with one PDC (server A) and one BDC (server B).
> We
> want to introduce a new WinNT server into the domain as a BDC (server C)
> and
> then promote it to a PDC which will demote the current PDC (server A) to a
> BDC. The question is will users be able to logon to the network during
> this
> process? The original BDC (server B) will still be running durning this
> time.
> Thanks