Each application's address space consists of 3 areas : operating system ( one instance shared by all jobs ); an application area which was unique for each application; shared virtual area used for various purposes including inter-job communication.
2.
The most significant motives for the rapid upgrade to 31-bit addressing were the growth of large transaction-processing networks, mostly controlled by CICS, which ran in a single address space and the DB2 relational database management system needed more than 8 MB of application address space to run efficiently . ( Early versions were configured into two address spaces that communicated via the shared virtual area, but this imposed a significant overhead since all such communications had transmit via the operating system .)
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