3270 terminal page-advance function

A transaction's output can be more than one full screen of data. You request the additional output by pressing the PA1 (program access 1) key on the terminal keyboard. If you continue to press the PA1 key, the terminal displays successive pages until you reach the end of the current message. If you press PA1 when there are no more messages waiting to be sent to the display station, the display remains unchanged or IMS sends an appropriate error message.