PATH
Packets are sent with the DL_UNITDATA_REQ message. If the destination has the same protocol address as the sender, it is only necessary to supply the hardware address of the destination; otherwise the full address must be used. Note that only a stream bound to the IPX SAP can send to another IPX stream.
To support Fast Path mode, the Open Transport CSMA/CD driver treats M_DATA messages as fully formed ("Raw") packets, including all addresses and headers. The only modification made before sending the packet to the hardware is to check for a 0 in the 802.2 length field. If 0 is found, the length field is set to the appropriate value. Support of this feature is optional; see Fast Path Mode for further information.