Google Hacking Diggity Project is a tool developed by Stach & Liu ( http://www.stachliu.com/). It uses Google and Bing databases to look for vulnerabilities in web sites. It can provide great help in securing a large website or domain.
There is very less available on configuring the tool. I had multiple proxy installed and wanted to bind the tool to one of the proxy, but it was not picking that one.
After playing around its configuration files and several settings, I found a simple solution for binding the tool to a specific proxy: It is: configure your IE browser to use that specific proxy. Search Diggity by default relays to the proxy bound to IE. ( not Firefox ;) )