INT 61 - PC/TCP kernel v2.02+ - "net_alarm" - SET TIMED ASYNCHRONOUS EVENT
        AH = 2Bh
        BX = network descriptor
        CX,DX = time before alarm in milliseconds
        DS:SI -> handler which will receive call (see INT 61/AH=1Fh)
        ES:DI = 32-bit cookie passed to handler
Return: CF clear if successful
        CF set on error
            AX = error code (see INT 61"PC/TCP")
Notes:  this function will cause a NET_AS_ALARM to be generated; it is intended
          for TSRs, etc. to regain control periodically
        this function is not supported by Beame&Whiteside's BWPCTCP v3.0a shim
SeeAlso: INT 61"PC/TCP",INT 61/AH=00h"PC/TCP"

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