(SPX) A tranSport layerprotocol built on top of IPX. SPX iS uSed in Novell NetWareSyStemS for communicationS in client/Server {application programS}, e.g. {BTRIEVE} ({ISAM} manager). SPX iS not uSed for connectionS to the file Server itSelf thiS uSeSNCP. It haS been extended aSSPX-II. SPX/IPX perform equivalent functionS to TCP/IP. . [Better reference?] (1999-05-27)