INT 21 - DOS 2+ - GET RETURN CODE
AH = 4Dh
Return: AH = termination type
00h normal (INT 20,INT 21/AH=00h, or INT 21/AH=4Ch)
01h control-C abort
02h critical error abort
03h terminate and stay resident (INT 21/AH=31h or INT 27)
AL = return code
Notes:  the word in which DOS stores the return code is cleared after being
read by this function, so the return code can only be retrieved once
this call should not be used if the child was started with AX=4B04h;
use AH=8Ah instead
SeeAlso: AH=4Ch,AH=8Ah

See also: 214B

214D - DOS 2+ - GET RETURN CODE