##### 8.1.6.1 Overview of Pragma Shared_Passive

The entities declared in such a categorized library unit are intended to be mapped on a virtual shared address space (file, memory, database). When two partitions use such a library unit, they can communicate by reading or writing the same variable in the shared unit. This supports the conventional shared variables paradigm. Entryless protected objects can be declared in these units, to provide an atomic access to shared data, thus implementing a simple transaction mechanism. When the address space is a file or a database, the user can take advantage of the persistency features provided by these storage nodes.