RH output (yours and theirs)?
Sorry. RH8 for both projects with WebHelp output.
The fact that they might be baggage files should not influence this at all; it's linking from your output files to their output files, regardless of how they got there.
As long as you can be assured of the location of all of these files in the final analysis, then simply create (coded in HTML) relative links, based on the folder hierarchy that will be in place.
Thanks, Leon. I didn't think it would make a difference but someone asked about the content being in a baggage file and wanted to be sure. Thanks for taking the time to respond.