INT D4 - PC-MOS/386 v5.01 - REMOVE A TASK
        AH = 21h
        BX = task ID (FFFFh for current task) (see AH=19h)
Return: CF clear if successful
            AX = ASCII percentage of System Memory Pool used
                (AH = tens digit, AL = ones digit)
            DS,SI destroyed
        CF set on error
            AX = error code (see INT 21/AH=59h)
SeeAlso: AH=22h

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