Describes the environment variables which can be used to tailor the overall XPA environment. ... XPA_ACL . ... The default is turn turn access control on. ... When an XPA server first starts up, it immediately tries to connect to the XPA name server program (xpans) on the host specified by the XPA_NSINET variable. ... For the inet method of socket connection, this variable specifies the host and port on which the XPA Name Server (xpans) is listens for new access points. ... The default is xpans_unix . ...