Okay, now we're getting to the meat in your question. Basically, you want to prevent users to log in multiple times, right?
If you would have said that right away, we could have pointed you to a couple of threads discussing solutions for this. One is to use CCONNECT.EXE formt eh Windows Resource Kit, another one is to restrict mapping to a hidden home share to one concurrent user. See Roaming profile
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There are two types of vessels, submarines and targets.
