[TxMt] enumerate all files in project

[Robert J. Carr]

I'm working on a command that I'd like to be able to apply to all
files in my project.  Looking at the env vars I only see items for
working with the current file.  Is there any way to get a list of all
files in the current project?

It is certainly possible this sort of thing is available somewhere in
the shared support ... how do I get more info about what's there?
Thanks!