Line spacing and page ejects can be under control of either the dialog or ISPF. If the dialog specifies CC on the LIST service request, the dialog controls all carriage functions, using the first byte of each line passed to ISPF as a carriage-control character. Therefore, when CC is specified on the LIST service request, ISPF ignores any SINGLE, DOUBLE, TRIPLE, PAGE, and OVERSTRK keywords.
ISPF causes an automatic page eject (regardless of CC keyword status) for a LIST service request that causes information to be written to a list data set for the first time in the session.