I want to block the "Google Talk" application on a workstation, without uninstalling it.
How do I do that?
you'd have to block the ports or the domain name at your firewall or router - the former could be a pain - you'd need to block ports 5222 and 443 - the later is a standard port used for https so it can be a bit of a pain. Alternately block the domain name talk.google.com using hosts.txt or at your firewall
I have no idea if this will block web access via gmail though.
(yes i know the google link is for unblocking gtalk, but blocking is unblocking in reverse)