Up to now, the only way I could figure out how to do this was to RunTool (e.g. "echo mytool.bat > C:\temp.txt"), then open the file in the macro, select the contents and copy it to a clipboard before I could use it.

Is there another way? What I envision is to capture the value of some environment variable with the batch file, write to stdout, have GetString (or some new macro command) capture that value and do further processing.