Patrick,
If you're asking this question, I will assume that you are on a "workgroup"
network as opposed to a "domain" network. In a workgroup network there is
no master computer; all computers are peers. You might have a file/printer
server that is more "shared" than other computers, but it has no more "rank"
than any other computer.
In a domain network there is a domain controller. If you are in charge of a
domain, and you don't know which computer is the domain controller, log in
to each computer and find out which one says it is "Windows Server" instead
of Vista or XP. None the less, in this case you should seek professional
help.
--
Daniel Jameson
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If the man asks you to hate another,
It is not so you can benefit at the expense of the other,
It is so he can benefit at the expense of you.