This message also lists the available devices. For a little more information about available devices, a one-line description of each device appears near the beginning of the file devs.mak. Following is some information about the output devices. Ghostscript normally opens the first one and directs output to it. You can also type 'gs -h' to see all the available output devices.
TEMP Defines a directory name for temporary files.
See the manual pages for ghostscript.