This environment variable is only available form the automation environments.



It's purpose is to point back to the Deployment Shared folder on the DS server.



If you move the deployment share to a different system, then you need to edit your boot images, and confirm that the drive mapping has changed as well.



When the clients boot into automation, then this environment variable will then be changed to the drive mapping that you changed in the boot image configuration.



If you want a different environment variable, pointing to a different server, then make sure that you map a drive to that other server in the boot image configurations, and then edit the boot image configuration startup files to create some other environment variable for that drive mapping.