Yes, it's called a firewall. Several available for free or trial download.
--
Richard G. Harper (MVP Win9x)
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"Tim" <(E-Mail Removed)> wrote in message
news:00c601c3667a$7d7be260$(E-Mail Removed)...
> Is there a way to block specific ports on windows 98
> machines? I have been looking but can't seem to find an
> answer one way or the other. Thanks.