was originally a site run by Mark Russinovich and Bryce Cogswell that had a collection of tools used to administer Windows machines. It was then purchased by Microsoft and is now located at … fault.mspx . These are unbelievably helpful when trying to troubleshoot a problem with your system. In particular, you can watch processes run in real time, watch the individual execution of certain calls within the operating system, watch TCP connections made out to the internet, and host of other things. Check it out.