After you have started the initialization of CICS®, you may want to override system initialization parameters specified in the SIT, PARM parameter, and SYSIN data set of the CICS startup procedure. You can do this by specifying new values for system initialization parameters at the system console.
If you specify the CONSOLE (or CN) keyword in the PARM statement of the EXEC PGM=DFHSIP statement or SYSIN data set of your CICS startup procedure, CICS prompts you to enter system initialization parameters at the system console.
Generally, CICS does not begin to read from the console until it has loaded the SIT and processed any initialization parameters that are coded in the PARM parameter and the SYSIN data set. CICS accepts system initialization parameters from the console until you terminate the input with '.END'.
Through the console, you can specify a SIT system initialization parameter only as the first parameter when prompted by message DFHPA1921, at which point CICS tries to load the specified SIT. If you try to specify a SIT system initialization parameter after CICS has loaded the SIT, it is rejected as an error.
When it is ready to read parameters from the console, CICS displays the following message (where nn is the reply ID):
nn DFHPA1104 applid - SPECIFY ALTERNATIVE SIT PARAMETERS, IF ANY,
AND THEN TYPE '.END'.
You can enter as many initialization parameters as you can get on one line of the console, but you must use a comma to separate parameters. CICS continues to prompt for system initialization parameters with displays of message DFHPA1105 until you terminate console input by entering the .END control keyword.
If you have coded PARMERR=INTERACT, and CICS detects a parameter error, either in the keyword or in the value you have assigned to it, CICS prompts you to correct the error with message DFHPA1912 or DFHPA1915:
DFHPA1912 'applid' SIT OVERRIDE 'keyword' IS NOT RECOGNIZED.
SPECIFY CORRECT SIT OVERRIDE.
DFHPA1915 'applid' INVALID DATA HAS BEEN DETECTED FOR SIT OVERRIDE
'keyword'. RESPECIFY THE OVERRIDE.
CICS prompts you to enter corrections to any errors it finds in the PARM parameter or the SYSIN data set after it has loaded the SIT, and as each error is detected. This means that if there is an APPLID parameter following the parameter that is in error, either in the PARM parameter or in the SYSIN data set, it is the APPLID coded in the SIT that CICS displays in messages DFHPA1912 and DFHPA1915.