FrontPage extensions are "things"
that need to be set up on your account for you to be able to publish
your site through Microsoft FrontPage. It takes one click from your
Control Panel to set up FrontPage extensions. It's that easy!
More technical explanation: FrontPage Extensions
are CGI programs which provide the server side implementation
of FrontPage. FrontPage communicates with the extensions via HTTP
using a Remote Procedure Call (RPC). When the server sees the
"POST" request addressed to the FrontPage server extensions,
it simply directs the request to the appropriate CGI program.
The extensions implement authoring (uploading/downloading documents,
ToDo lists), administration (setting end-user, author, and administrator
privileges), and dynamic content (browse-time WebBot components).
Without the FrontPage Server Extensions you will not be able to
take advantage of the WebBots that are available through FrontPage.
Also, without the extensions you cannot author and administer
your Web using the tools provided as part of the FrontPage Editor/Explorer