<NetworkiNg, protocol> (SPX) A traNsport layerprotocol built oN top of IPX. SPX is used iNNovell NetWare systems for commuNicatioNs iNclieNt/server {applicatioN programs}, e.g. {BTRIEVE} ({ISAM} maNager). SPX is Not used for coNNectioNs to the file server itself this uses NCP. It has beeN exteNded as SPX-II. SPX/IPX perform equivaleNt fuNctioNs to TCP/IP. . [Better refereNce?] (1999-05-27)