Many systems now handle so much work so quickly that you cannot always keep up with the messages that demand operator response. These messages roll off the screen before you can respond. The action message retention facility keeps these messages, including the WTORs and JES3 messages, so that you can see them at a later time. (While you are examining the messages that you missed, you might, of course, miss more messages. Experience with your system will help you determine how frequently you need to check for retained action messages.)
The DISPLAY R command allows you to display all outstanding action messages or a subset of these messages. For example, to display all outstanding action messages at your console, enter DISPLAY R,M. To display all the outstanding critical eventual-action messages (descriptor code 11), enter DISPLAY R,CE. See z/OS MVS Planning: Operations for use of the DISPLAY R command.