Being able to log on to multiple machines at the same time has always irked my security conscious. While I can see the need for it and have done it plenty of times myself I was pleased to find that Microsoft has a tool that can limit concurrent sessions. This is a brand new tool and has been around for about year…that I know of but LimitLogin v1.0 is a resource kit utility that can be downloaded from here.
Here is a list of clients that work with it:
Windows 2000 Server Service Pack 4 and above (Including Terminal Server sessions)
Windows XP Professional Service Pack 1 and above
Windows Server 2003 (Including Terminal Server sessions)
Make sure that you read through the help file before implementing it in your test environment…trust me it will answer a lot of questions.