The LIST service allows a dialog to write data lines directly (without using print commands or utilities) to the ISPF list data set. You specify the name of the dialog variable containing the data to be written on the LIST service request. The amount of data that can be written with one LIST request is one or more lines totaling up to 32 767 bytes, the maximum size of the dialog variable.
The list data set, if allocated, is normally processed when you exit ISPF. A LIST command is available to allow you to process the list data set without exiting ISPF.