You can use the UNKNIDS keyword on the CONSOLE statement to control whether the console is to receive messages that are directed to unknown console IDs, such as one-byte console IDs which are no longer supported. To enable a console to receive such messages, specify UNKNIDS(Y) for this console on the CONSOLE statement. You can also use the VARY CN command to change this console attribute. If you do not specify this attribute, the default is N.
The UNKNIDS queuing attribute allows messages issued with 1-byte console IDs to be queued to some console. Messages marked with the UNKNIDS queuing attribute will be queued to any console that requests UNKNIDS messages. Note that this may or may not be the console that would have corresponded to the 1-byte console ID.