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If you are running any type of windows software the following tools are made by MS to keep eye on the os.
http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx Process Monitor even better than the default task manager.
http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx Tcpview See the ip address and domain name
And finaly the whole package
http://technet.microsoft.com/en-us/sysinternals/bb842062.aspx many of those tools are useful.
http://www.xnview.com/en/index.html Screen capture and image viewer.
And this only works in XP but still helpful for tweaking XP
http://www.microsoft.com/windowsxp/Downloads/powertoys/Xppowertoys.mspx For Xp Tweak UI allows alot of controls but be careful with it. And the other xp power tools lots of fun heeh
Post more tools you use to help with testing.