INT 21,4D - Get Return Code of Sub-process

AH = 4D

on return:

AH = system exit code (indicates normal termination)

= 00 for normal termination

= 01 if terminated by ctl-break

= 02 if critical device error

= 03 if terminated by ~INT 21,31~

AL = child exit code

- retrieve child process and system exit codes

- this function can only be used to retrieve the exit code once

multiple attempts to read exit codes will cause errors