The trick with frames is to use the NOFRAMES element. A meaningful NOFRAMES element should always be used in a frameset document and should at the very least include links to the main frame or frames. Then be sure to include a navigation menu or sitemap on every page. That way the search bots can slip past the Frame and into the Frameset pages; once inside they can search your entire site using the navigation menu or sitemap. Here is a typical example of the NOFRAMES element.
<NOFRAMES>
<BODY BGCOLOR="#FFFFFF">
<FONT COLOR="#5A7E5A" SIZE="4">If you are reading this page, your browser may not support frames. This is the website of <A HREF="Home.html">The Widget Company</A>.<BR>
We specialize in widgets such as <A HREF="Equipment/widgetA.html">Widget A</A>
To find out more about how we can help you, please check out our <A Href="Current.html">current inventory</A>.
</BODY>
</NOFRAMES>
Be sure to include your company or website name on every page so that visitors who jump into an internal page through a search engine will know who they are visiting. I have been using Frames to control the layout of my company website for years and we are always listed in the top 10 for our targeted keywords on the major search sites. An added benefit of using frames is that it makes it more difficult for your competitors to steal your source code and content.