Expects: AX    0006H
BX    an API Identifier (see below)
Returns: AX    0000H and CF is clear (NC) if successful and...
ES:BX address of an SwApiInfoRec structure for the API in BX
Info: This locates the program (global or in the current session) which
provides the best level of support for certain application
interface services (APIs).

It provides a means for such programs a NetWare and LAN Manager
to negotiate to find which of them provides the best support for
a particular API.

Standard programs have no reason to use this service.

BX is a code that specifies the API in which you are interested:
0002H   802.2
0003H   TCP/IP
0004H   Lan Manager named pipes
0005H   NetWare APX

Programs which hook into the notification chain (SwSrvcFn 0004H)
indicate their API support via a list of SwApiInfoRec structures
which are pointed to by the pfarAPIs field of SwCallbackInfoRec
used in that call.

INT 2fH 4bxxH (switcher functions)
- -

SwSrvc Fn 0006H: Query API Support