qa.hlp (Table of Contents; Topic list)
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Int 21H Function 4DH
   Summary  Notes  Example  Back
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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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