We have a Windows CAD program that looks to the System Variables under the Environmental Variables to find the location of it's configuration information. Sometimes we need to use 2 sets of configuration information and right now that would require going into Environmental Variables and changing the System Variables each time. I had thought about using a batch file to set the System Variable and then launch the CAD program but I wasn't sure if this would work. I would then have a batch file they could run after to set them back to the original System Variables. Any help and ideas are appreciated.