OpenXPP
OpenXPP Open XPP driver
#include <AppleTalk.h> AppleTalk Manager
OSErr OpenXPP(xppRefnum);
short *xppRefnum ; driver's reference number
returns Error Code; 0=no error
OpenXPP opens the XPP driver.
Returns: an operating system Error Code.
noErr (0) No error
portInUse (-97) Port B is already in use