> Is there a maximum number of outstanding WTORs allowed? How long does a 
> message token last.

There are two CONSOLxx parameters, RLIM and RMAX, that govern WTOR and REPLY 
behavior.  These can be dynamically changed via the CONTROL M (K M) command.  
RLIM sets the REPLY LIMIT, number of WTORs that can be outstanding at any time. 
 If there are RLIM WTORs already outstanding, new WTORs will wait for the count 
to reduce to below RLIM.  Programs with certain attributes can breach RLIM and 
approach RMAX.  If the system exhausts all the REPLY IDs available to it 
(systems reserve the IDs in chunks), it will then serially reuse REPLY ID 0.  
If REPLY ID 0 is already outstanding, a subsequent WTOR will wait for ID 0 and 
the system will issue IEA557A.

A WTOR will "last" until there is a valid REPLY command for that ID or the 
program requesting the REPLY terminates.

Scott Fagen
Chief Architect - z Systems and Workload Automation
CA Technologies

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