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An output device can only be used if it has previously been entered in the printer file under Printers in VC/m Set-up.

When an input field prompts for an output device, it is entered using the name which was specified in the printer file.

If a device has been set up in the printer file with ??? for the $IO value of the device, the actual device ID is entered at the time of printing.

For example, if a device called FILE is set up with a device ID of ???, at any Output Device prompt, the device name is input, followed by a single space and the actual device ID to be used:

Output device [FILE MYFILE.TXT ]

Similarly, if three question marks have been entered at any point in the open parameters field of the printer file, a value can be supplied at print time to substitute the three question marks.

For example, the open parameters contain the following:

Open parameters [(file="???":mode="W") ]

At print time, the file name can be specified at the Output Device field:

Output device [FILE MYFILE.TXT ]