Using the Mark of the Web (MOTW)
Called Mark of the Web (MOTW), it's a comment added to the <head> section that indicates what Web site the content belongs to. The MOTW must follow a specific format, including the number of characters in the string. For example:
<!-- saved from url=(0025)http://www.helpstuff.com/ -->
The MOTW must start with the comment code and text "
saved from url=". The numbers in parentheses must match the number of characters in the URL string (including the trailing backslash).
If this is for a new site, or if the domain is not known, you can use
about:internet as a valid URL. For example:
<!-- saved from url=(0014)about:internet -->
I'm slowly adding MOTW to all the sites I develop...it will take awhile, but because it only helps me in development, there's no rush.
For more information on MOTW, visit MSDN.
Don Lammers from Shadow Mountain has informed me that MOTW, when used locally, will prevent links to a PDF from opening, and users don't receive any warning as to why the links aren't working. If you have to create links to PDF files, you won't be able to use MOTW. This only affects those folks developing local HTML-based Help.