The DBCAREA is the communication structure between an application and CLIv2. Applications use it to forward control and data information. CLIv2 uses it to return control and data information. An application may use a single DBCAREA or multiple DBCAREAs. CLIv2 retains no knowledge of a particular DBCAREA across multiple CLIv2 calls. CLIv2 is concerned only with the values for DBCAREA that are meaningful to the routine called.