If a PP2 application running in an IBM mainframe environment submits a SQL request without specifying an explicit connection to the server, an implicit connection is attempted, based on the job or session under which the application is running.
However, workstation-attached platforms do not provide an implicit connection mechanism. See Teradata® Call-Level Interface Version 2 Reference for Workstation-Attached Systems, B035-2418 for details of the implicit connection mechanism.