What is Virtual PC technology for A/V software?

Run virus in VM so it pwnz only that VM and not your real box.

You may like to read the nice documentations on:

1. VMWare Workstations (forget the servers)

2. Virtutech Simics (by far, the most advanced - warning: knowledge of python needed to get it really automated!)

3. Microsoft Virtual PC (Muwaahhhhhhhahahahhahahah!!!!!! - the best thing for infections!)

Alternatively, you may try and google for a CHM version of how antivirus authors break viruses.

Have Phun