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  Description:  Get Return Code
 
  Used by a parent process, after the successful execution of an EXEC call
  (Int 21H Function 4BH), to obtain the return code and termination type
  of a child process.
 
  Input             Output
  ══════            ═════════════════════════════════════════════════
  AH=4DH            AH=exit type
                       00H if normal termination by Int 20H, Int 21H
                       00H Function 0, or Int 21H Function 4CH
                       01H if termination by user's entry of CTRL+C
                       02H if termination by critical-error handler
                       03H if termination by Int 21H Function 31H or
                            03H Int 27H
                    AL=return code passed by child process (0 if child
                        terminated by Int 20H, Int 21H Function 0, or
                        Int 27H)
                                    -♦-