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Where is the size of the RUWAPOOL kept

You want to know how CICS Transaction Server z/OS (CICS TS) keeps track of the High Water Mark (HWM) of RUWAPOOLs for different transactions. How does the first START_PROGRAM of a task know what amount of storage to allocate for the LE_RUWA? Does CICS TS need some kind of control blocks (or tables) to store them? If so, which control block is it?