SNA 0 System Network Architecture Arquitectura de Red de Sistemas 1997-06-08 APPCAdvanced Program-to-Program Communication APPC/PCAdvanced Program-to-Program Communications in PC BIUBasic Information Unit DLCData Link Control RHResponse Header RUResponse Unit System Network ArchitectureSNA 1 Social Network Analysis Análisis de Redes Sociales 2008-06-11 Social Network AnalysisSNA