PrDrvrOpen
PrDrvrOpen Low-level printer driver open
#include <PrintTraps.h> Printing Manager
void PrDrvrOpen( );
PrDrvrOpen opens the printer driver, reading it into memory if necessary.
Returns: none

Notes: PrDrvrOpen is functionally equivalent to:
OpenDriver( sPrDrvr,...);
The system equate sPrDrvr is defined as "\p.Print" in the PrintMgr.h
header file.
This low-level function is not used by most applications. See PrOpen for
the higher-level call.