http://stefanstools.sourceforge.net/ (http://stefanstools.sourceforge.net/)
There is a tool for sending message to a window.
Can be used in command line
http://www.telerik.com/fiddler (http://www.telerik.com/fiddler)
Debugging the web
http://www.helpndoc.com/download (http://www.helpndoc.com/download)
Making Help files