SPX | Article about SPX by The Free Dictionary
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A graphics program for the Atari
spx (filename extension)
SPX(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.