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INT 21 - European MSDOS 4.0 - "CWAIT" - WAIT FOR CHILD TO TERMINATE
        AH = 8Ah
        BL = range (00h command subtree, 01h any child)
        BH = suspend flag
            00h suspend if children exist but none are dead
            01h return if no dead children
        CX = Process ID of head of command subtree
Return: CF clear if successful
            AH = termination type
                00h normal termination
                01h aborted by Control-C
                02h aborted by I/O error
                03h terminate and stay resident
                04h aborted by signal
                05h aborted by program error
            AL = return code from child or aborting signal
            BX = PID of child (0000h if no dead children)
        CF set on error
            AX = error code (no child,interrupted system call)
Desc:   get return code from an asynchronously-executed child program,
          optionally waiting if no return code is available
SeeAlso: AH=4Dh,AH=80h,AH=8Dh

See Also: 214B
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