PrDrvrVers
PrDrvrVers Obtain printer driver version number
#include <PrintTraps.h> Printing Manager
short PrDrvrVers( );
returns Printer driver version number
PrDrvrVers lets you determine which version of the printer driver is
active.
Returns: an integer identifying the version number.

Notes: The PrintMgr.h file defines a named-constant iPrRelease. Compare this
constant to the PrDrvrVers return value.
The driver version number can also be obtained by reading the iPrVersion
field of any validated TPrint structure.