This particular page resides on the Microsoft TechNet site, in the Resources for IT Professionals section. It is not behind a secured firewall. It is a documentation page, and includes an excellent chart to assist in realizing the full functionality of the Microsoft Bing search engine.
UPDATE: I was pleasantly surprised by Microsoft’s official policy for embedding screen shots of Microsoft’s content on personal website. Here is the chart documenting Microsoft Bing search syntax that I referenced in the hyper link in my preceding paragraph:
*This link to the Microsoft Intellectual Property Permissions policy helped me to determine allowed usage of Microsoft content.