INT F1 - Common ISDN API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running.  Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. (CAPI) v1.1 - "API-GET-MESSAGE"
	AH = 04h
	DX = application ID (see AH=01h)
Return: AX = status (0000h,1002h,1006h,1007h) (see #04069)
	ES:BX -> message if successful (see #04071)
Range:	INT 00 to INT FF, selectable by program parameter
Notes:	the caller is required to provide at least 512 bytes of stack space
	the returned message may be overwritten by the next call to this
	  function
SeeAlso: AH=03h