Virtual Printers in Printer INF Files
A virtual printer is a print destination, such as a fax server or electronic document, that is not a physical printer. Because a virtual printer does not have a hardware ID, it must be represented in your printer INF file by a null hardware ID.
To insert a null hardware ID in an INF file, add a second comma in the models section of the INF between the Install section name and the Compatible ID. The following example shows how to create a null hardware ID for the indicated fax printer.
"Objectworld Fax Printer"=OWFAX,,Objectworld_Fax_Printer
For more information about virtual printers in INF files, see DriverCategory in Printer INF File Entries.