The logon post-prompt exit (IKJEFLD3) allows an installation to modify logon processing. This exit receives control after the logon command processor has processed the LOGON command and full-screen panel information. This exit receives control in an authorized state and receives the standard TSO/E exit parameter list, including a 4-byte user word, if supplied at logon by a logon exit. The logon post-prompt exit routine can use the parameter list and user word to perform the following functions:

• Examine the JCL statements
• Modify the JCL statements
• Provide additional JCL statements
• Terminate the LOGON command
• Update fields in the PSCB and the UPT