The GWNAU definition statement is an NCP-only definition statement that defines representations of cross-network logical units and SSCPs within the gateway NCP. VTAM® does not use the definition statement when processing the NCP generation definitions. In some configurations, VTAM’s ability to activate SSCP-SSCP sessions depends on proper use of the GWNAU definition statement. See z/OS Communications Server: SNA Network Implementation Guide for information about how this definition statement relates to session activation.