Let me state categorically that existing programs that issue messages with 
one-byte console IDs will continue to work. 

What we have done is remove the ability to create new programs or re-
assemble old programs using one-byte console ID interfaces. The ability to 
specify one-byte console IDs on the WTO and WTOR (and a few other macros) 
has been removed.

We have also removed two-digit numeric console IDs as an external on the 
L=, CN= and CN() command parameters. 

In z/OS R8, we have gotten rid of the Master Console, which used to be the 
console to which messages were queued if the console they had been 
directed to was unknown. In R8, we have created a new console queuing 
attribute called UNKNIDS which allows messages directed to an unknown 
console to be queued to any console with this attribute. (We likewise 
created another queuing attribute INTIDS which allows messages directed to 
console ID 0 to be queued to any console with this attribute).

Removal of the ability to specify one-byte console IDs and the 
introduction of the UNKNIDS attribute may seem unrelated, but in a future 
release messages issued with one-byte console IDs will be treated as 
unknown messages. However, the UNKNIDS attribute will allow these messages 
to still be queued to one or more consoles of your choice. So let me 
reiterate again: 1) programs that issue messages with one-byte console IDs 
will continue to work; 2) messages issued with one-byte console IDs can 
continue to be queued to consoles. However, in some future release, the 
message will be queued by the UNKNIDS attribute rather than its one-byte 
console ID because in that future release no console can have a one-byte 
console ID.

W. Kevin Kelley  IBM POK Lab -- Core Technical Development

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