ISMF uses the ISPF log to record information about the execution of line operators, commands, and error conditions that it detects during processing. Used with the information recorded for TSO/E and ISPF tasks, the entries made by ISMF enable you to keep track of the tasks you perform in a given ISPF or ISMF session. The entries can also assist in diagnosing errors. To ensure that logging is done, you must specify a primary allocation greater than zero in the ISPF log parameters. If you specify zero as the primary allocation, no information about your session appears in the ISPF log. For more information about specifying ISPF log parameters, see the z/OS V2R2 ISPF User's Guide Vol I. ISMF records a standard set of information during each session. Entering Y in any of the fields that control logging on the Logging/Abend Control Entry Panel determines what additional information is recorded in the ISPF log for each ISMF session. You can choose to log more detailed data about error conditions. You can also log inter-module and trace-point trace records.