You don't mean at once do you? That's the benefit of having a domain....is
that you have centralized security. The local security is just
that...local. You have to go to the individual machines and change them
manually.
I do mean all at once . I have an image for a machine . A IT suppoprt
person who knew the password is no longer with us, of course, they would
have local admin access to all machines now how can I change this ?