How do I display the actual file name printing on the Banner page of the Xerox Printer, captioned in the subject line?
I am not to sure you will be able to modify this data. Did you considered using a Separation page as workaround?
Separation Page is a option you can find under the Advanced tab on the Properties features of your Printer wizard on Windows OS. This is job definition file that when in use will be picked up by every job you send.
This means to be able to use this you would have to change the way your printing at the moment. HP UX 11>> Printer to HP UX 11 >> Windows >> Printer.