(1) The act a terminal user performs in order to identify a user to IMS. When the terminal is an ETO terminal, the signon process also creates a user structure and connects the user structure to the terminal structure.
(2) The procedure by which the user starts working at a workstation.
(3) A request that is made on behalf of an individual CICS or IMS application process by an attachment facility to enable DB2 for z/OS to verify that it is authorized to use DB2 resources.