Shared border are a form of FP include with the included content coming from the files in the _border folder within the web. To
convert an existing page to a shared border page you'll have to move the content from the page to the appropriate shared border
include file (left,top,right, or bottom.htm). Next, you have to add the shared borders meta tag to the page indicating which border
you wish to use.
<meta name="Microsoft Border" content="tb"