I may out of date here... :) The Win NT Resource Kit includes a Network Watch utility that does that. Obviously, not programatically.

Vlad

>I'm not sure if there's a way to do so programmatically from a workstation, but from the server (or from a workstation logged in as a domain admin with remote administration enabled) the Server Maintenance application under Administrative Tools can be used to view the active connections of each user in the domain to any server resource.
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>hth,
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>Ed