Main Frames Window
This frame is usually the one with all the content crap in it. You can also view the source of this panel only by pointing the mouse somewhere in this panel, right click, then select view source. Generally the panel on the left is used for navigation, ie. has buttons that you can press so that the main panel (this one) changes.
Frames tend to have a problem being indexed by search engines due to old browser settings. Many of the old browsers could not handle viewing frames. This applies with the search engine spiders as well. When a search engine spider sees the tag:
<frameset cols="144,863*" frameborder="YES" border="1" framespacing="0" rows="*">
<frame name="leftFrame" scrolling="AUTO" noresize src="left_window.htm">
<frame name="mainFrame" src="main_window.htm">
</frameset>
Then it will completely ignore it and jump to the next set of tags. If you have a <noframes> tag in your coding, then you can place a page of coding within here for the search engine spiders to index. The <noframes> tag was designed for the older browsers so that users could have the option of viewing another page if their browser could not handle frames.
Go to the "View" menu, then select "Source" to see what I have done with my <noframes> tag.