If you use environment variables in a command line or a batch file, windows will parse those out before passing the command line to HelpStudio, so yes you should be able to use them.

We use HelpStudio 2 to run the nightly doc build, and we haven't had any problems with relative paths since DocX 5 came out. We use a simple batch file and Cruise Control to run the build, but that's about it. The nightly build script we run looks like this: %HELPSTUDIO% = path-to-hs2.exe del...

Team build features - including an MSBuild task, a command line build tool and accompanying support are available for holders of a team license (5 or more licenses). At present, these features are not available in the evaluation version I'm afraid. Contact support@innovasys.com directly for more...