INT 2F - MS WINDOWS - "VNETBIOS" VIRTUAL DEVICE API
        AX = 1607h
        BX = 0014H (VxD identifier of "VNETBIOS")
Return: ES:DI -> 128-byte table specifying VNETBIOS actions for each NetBIOS
                command code (see below)
Note:   VNETBIOS (Virtual NetBIOS) calls this function to determine whether
          the NetBIOS has an extensions Windows should know about
SeeAlso: AX=1607h/BX=0015h

Values for action code:
 00h    "VN_Unknown" unknown command
 04h    "VN_No_Map"  no memory mapping necessary
 08h    "VN_Map_In"  input buffer is quickly used, so no global mapping needed
 0Ch    "VN_Map_In"  output buffer is quickly used, so no global mapping needed
 10h    "VN_Map_In_Out"  buffer is quickly used, so no global mapping needed
 14h    "VN_Chain_Send"  the chain-send command
 18h    "VN_Cancel"     special case for cancel command
 1Ch    "VN_Buffer_In"  buffer is incoming
 20h    "VN_Buffer_Out" buffer is outgoing
 24h    "VN_Buffer_In_Out" buffer used for both incoming and outgoing data