[tde-users] how to set environment variable?

I'm sure this is easy, but I haven't been able to find the right place to do it :-( How do I set the value of an environment variable so that when I run a program from the main T menu, the program will automatically get the correct value of the variable? I looked at Trinity Control Centre (which is where I expected to find something labelled "Environment Variables", or something similar) but I don't see anything like that there. Doc -- Web: http://enginehousebooks.com/drevans