Things You Can Do With Rundll32.exe
This site has loads of great uses for RUNDLL32.exe that can be accessed from the Run Menu or from a RUN command. Very useful for getting to control panel functions from your users locked-down machines.
http://www.dx21.com/SCRIPTING/RUNDLL32/REFGUIDE.ASP
http://www.dx21.com/SCRIPTING/RUNDLL32/REFGUIDE.ASP