Thread attachment
In an MPP or IFP region, IMS makes a thread connection when the first application program is scheduled into that region, even if that application program does not make a WebSphere MQ call. In a BMP region, the thread connection is made when the application makes its first WebSphere MQ call (MQCONN or MQCONNX). This thread is retained for the duration of the region or until the connection is stopped.
For both the message driven and non-message driven regions, the recovery thread cross-reference identifier, Thread-xref, associated with the thread is: