Inside <frameset>s

The <noframes> tag

If you use <frame>s in your web site, always add a <noframes> section.

This not only serves people with less sophisticated browsers or with frames support turned off, it helps search engines find their way too.

Place some meaningfull text between the <noframes> tags, and don't forget a hyperlink to all your other pages. Again, some search engines lose their way in complicated frame sets, and will only follow the links in <noframes>.

So, avoid statements like "Sorry, your browser doesn't seem to support frames", since that may turn out to become the description that the search engine will display for your page.