Function 4Dh Get Return Code of a Subprocess (WAIT)
Gets return code from functions 31h and 4Dh (ERRORLEVEL)
entry AH 4Dh
return AL exit code of subprogram (functions 31h or 4Ch)
AH circumstance which caused termination
00h normal termination
02h critical device error
03h terminate and stay resident (function 31h)
note The exit code is only returned once
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