NBPUnload
NBPUnload Make the .NBP driver purgeable
#include <AppleTalk.h> AppleTalk Manager
returns Error Code; 0=no error
NBPUnload makes the NBP driver purgeable; the space is not actually
released by Memory Manager until necessary.
Returns: an OSErr; an integer Error Code. It will be one of:
noErr (0) No error

Notes: This call only applies to a Macintosh 128K; on any later Macintosh,
NBPUnload has no effect.