SAP SHM CLASSES documentation, setup help and example usage

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Shared Objects - Classes and Interfaces
The hierarchy of global classes that are involved when working with shared objects is as follows:
CL_ABAP_MEMORY_AREA
|
|-- CL_SHM_AREA
| |
| |-- Area Classes
|
|-- CL_IMODE_AREA

Meaning of the three predefined system classes:

CL_ABAP_MEMORY_AREA is the superclass of all area classes.

CL_SHM_AREA is the superclass of all self-defined area classes.

CL_IMODE_AREA is a predefined area class for the internal session.

There is also a system interface, which must be implemented by the class for the optional area constructor:
IF_SHM_BUILD_INSTANCE
|
|-- Area Constructor Class