
Robot metatags direct search engines within your site (if they read the robot tag that is). Setting the metatag here will be the default value for EVERY PAGE served from your site. 
The exception to this rule would be when a module developer sent a different robot meta tag to the layout object. This would be useful in say a calendar module where the links
could become infinite.<br />
Here are the options:
<ul>
<li><b>all</b> - allows all of the files to be indexed</li>
<li><b>none</b> - does not allow any file to be indexed, do not follow any hyperlinks</li>
<li><b>index</b> - this page may be indexed</li>
<li><b>noindex</b> - this page may not be indexed</li>
<li><b>follow</b> - allows hyperlinks from this page to be followed</li>
<li><b>nofollow</b> - no hyperlinks from this page may be followed</li>
</ul>
