If your web site is running under Windows, the situation is straightforward: run the Web Access/Web Requests site under your current web server (ideally as a separate application in the same pool).
If your web site runs on a different platform (e.g. under Apache running on a Linux system), we recommend something like SQUID. SQUID is a free software package that can analyze a URL and send HTTP requests to different servers based on patterns within the URL. SQUID could therefore send MainBoss-related URLs to a Windows server, while sending other URLs to your normal web site.