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NCL procedures, defined in the TCT to service secured transactions, execute in a special APPC region built-in response to an attach request for a specific user ID. Normally all attached requests for the same user ID execute in the same APPC region. When the last NCL procedure completes execution the region is deleted.
To restrict the building of an APPC user region to a given user ID, specify a DLT entry using the USERENV operand of the DEFLINK command. The options for the operand are GLOBAL or LINK.
If GLOBAL (the default) is specified, an APPC region is built to service all attach requests from the same user ID from any remote LU.
If LINK is specified, an APPC region is built to service attach requests, for a given user ID, received from the remote LU defined by the DEFLINK definition.
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