If you add new components during a FrontPage editing session, you must perform a Recalculate Links operation to update the client-side cache. Normally this is done from the FrontPage Tools menu. However, the FrontPage Server Administrator also supports the Recalculate Links request from the command line interface. The extensions build a private registry of custom components containing an aggregation of the important facts from the bots and/or _vti_bot directories. This registry is stored in a string in a file named _vti_pvt/bots.cnf in the Root Web content directory.
Every time you update a FrontPage component implementation on the server, you must increment the version number in the corresponding .inf file and recalculate the links in the web. Otherwise clients will keep using earlier versions of the component in their local cache (in the ‘botcache’ directory under the FrontPage installation directory).