Transaction work area (TWA)
The size of the transaction work area is determined by the TWASize option in the Transaction Definitions (TD). If this is given a nonzero value, the TWA is always allocated, it lasts for the duration of the transaction, and it is accessible to all the programs that are in the transaction. Processor overhead that is associated with using the TWA is minimal. You do not need an EXEC CICS GETMAIN command to access it, and you address it with a single EXEC CICS ADDRESS command.