INT 61 - PC/TCP kernel v2.05+ - "net_swap" - EXCHANGE TWO NETWORK DESCRIPTORS
        AH = 28h
        BX = network descriptor 1
        CX = network descriptor 2
Return: CF clear if successful
        CF set on error
            AX = error code (see INT 61"PC/TCP")
Note:   the two descriptors will exchange places; both must be local or both
          global
SeeAlso: INT 61"PC/TCP",INT 61/AH=00h"PC/TCP"

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