When an OPEN or USE command includes no mnemonic space argument, Caché uses the default mnemonic for that device type. The Terminal setting specifies the default mnemonic for terminal devices.
The value n is a Caché routine name. ^%X364 is the default for terminal devices. You can use this default, or reset it by changing the value of as needed. See the “Controlling Devices with Mnemonic Spaces” chapter in the Caché I/O Device Guide.
As described above.
On the page System Administration > Configuration > Device Settings > IO Settings, in the Terminal row, enter a Caché routine name.