I'm not sure if this will help, but there is a software product called Link It you might find interesting.
Thank you. I am sending questions to this company about what Link It can do. I'll post what I find.
I received a response to my email to Affixion, the company that designed Link It. Here is what they said:
LinKit! allows you to link help topic to web pages as long as these pages have different titles (as shown in the left hand corner of the blue title bar at the top of your screen. Many web apps and web sites have alternating titles, so in many cases LinKit! is perfectly suitable to create contextsensitive help for such environments.
Since our application does not have unique page titles, this application is not a solution for us. Anyone else have any ideas?
All the ways of calling CSH that I know of require work on the part of the developers and as that is not available to you, I don't think there is any solution.
See www.grainge.org for RoboHelp and Authoring tips