(1) In OSI, system-defined values that are used as the initial values of certain parameters. In OSI Communications Subsystem, side information is a combination of (a) information in the OSI Communications Subsystem information base, and (b) information provided by directory service.
(2) System-defined variables that are used for the initial values of the communications element of the SAA Common Programming Interface partner_LU_name, mode_name, and TP_name characteristics.