HTML REL and REV Attributes

http://vancouver-webpages.com/META/reltags.detail.html

<LINK rel=help href="http://some.org/help.html">

where http://some.org/help.html is a help page for the current document.

<LINK rev=help href="http://some.org/index.html">

where the current document is a help page for http://some.org/index.html