The SETLOG procedure defines a logical name. SETLOG is available only under VMS.
If this keyword is set, RMS (VMS Record Management Services) interprets the equivalence name as a device name.
If this keyword is set, the logical name is not copied from the IDL process to its spawned subprocesses.
If this keyword is set, the logical name cannot be duplicated in the same logical table at an outer access mode. If another logical name with the same name already exists at an outer access mode, it is deleted. See the VMS System Services Manual for additional information on logical names and access modes.