SPX - Computer Definition
The Transport Layer (Layer 4) protocol in Novell NetWare for exchanging packets between LANs. Internetwork Packet Exchange (IPX) is the associated Network Layer (Layer 3) protocol in the IPX/SPX protocol suite. SPX is similar to the Transmission Control Protocol (TCP), but is not industry standard and has been overwhelmed by the TCP/IP protocol suite. See also IPX/SPX, LAN, Network Layer, protocol, protocol suite, TCP, and Transport Layer.
(Sequenced Packet EXchange) The transport layer protocol in the NetWare operating system. Similar to the TCP layer in TCP/IP, it ensures that the entire message arrives intact. SPX uses NetWare's IPX as its delivery mechanism. Application programs use SPX to provide client/server and peer-to-peer interaction between network nodes. See IPX.