Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 4Dh
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     This function will yield the return code of a child process only
     once. A subsequent call without an intervening EXEC (Int 21h
     Function 4Bh) will not necessarily return any valid information.
 
     This function does not set the carry flag to indicate an error. If
     no previous child process has been executed, the values returned
     in AL and AH are undefined.
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