PrintProcessor

PrintProcessor = display-name, filename

Specifies a print processor that supports the installed printer model.

display-name A user-displayable, descriptive name for the print processor. This string may not contain commas.
filename Names a DLL that is the print processor that supports the printer model installed by the Install section of the INF file.

If no PrintProcessor statement is used in the Install section or a Data section it refers to, then the default print processor installed as part of Windows 95 is used to support the installed printer. (The default print processor is part of SPOOLSS.DLL).

It is a good idea to put the display-name string in the [Strings] section of the INF file, along with all the other strings that may be displayed to the user, in case displayable strings have to be translated for international markets.