MPPClose
MPPClose removes the .MPP driver and any data structures associated with it from memory.
portInUse (-97) Port B is already in use
portNotCf (-98) Port B not configured for AppleTalk
Notes: If the .ATP driver or NBP code were also installed, they're removed as
well. MPPClose also returns the use of port B to the Serial Driver. Warning: Since other co-resident programs may be using AppleTalk, it's
strongly recommended that you never use this call. MPPClose will completely disable AppleTalk; the only way to restore AppleTalk is to call