stress testings tools for simulating multiple users accessing a system

I am looking at the possibility of virtualizing an existing system with Hyperv and want to see how well it will run virtualized.  What tools are there for me to simulate 15 to 20 people simultaneously doing what they usually do on the system?
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My fravorite tool for stress testing a system is Prime95. You can run multiple instances of this program to stress out every core of the processor and ram. Here is a good Wikipedia articles about this program: The website for Prime95 seams to be down right now, but you can download the program here:
I hope this helps. Good luck.
lineonecorpAuthor Commented:
I know about Prime 95 but I'm looking for something more specific that simulates mulitple Terminal Serminal server users in the type of environment I'm describing.  Or even a reference guide or real world experience?

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lineonecorpAuthor Commented:
This document is good but doesn't really deal with HyperV which is the issue - I wanted to know what kind of a hit it would be. However in another related question - ID:23896654 - which you answered as well - I seem to have been given some good leads so I'll close this now. Thanks.
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