Answer to "what are shared borders"?
FrontPage allows you to include any and all shared borders (top, bottom, left, and right) to your pages within a particular web site. The shared borders allow you to specify HTML (text, images, navigation, etc) to be placed on your pages. The benefit is that you do not have to update each and every page when editing the content of the shared borders. Update one page, and all pages are updated with the change(s). They can be quite handy.
Now, I have not come across any examples that simulate shared borders...not on any basic web sites. I wouldn't know about other languages, etc.