If user DOES NOT have ICA client installed, user sees ICA file as a text file. User fills this in, presses enter, whoosh, taken right in to application (this published app passes the username into the app), all runs as expected, no problems. If user has Win ICA client or plug-in installed, Window opens up with Terminal Service type login to server.
Web page has an HREF link to an ICA WINDOWS client file sitting on web server (in same folder as web page, this is real simple).
Sadly, the Mac Client Admin Guide is not helpful, so far for what I want to do.