SAP CALL PROCESSING BLOCKS documentation, setup help and example usage

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Calling Processing Blocks
In every processing block of an ABAP program, you can call processing blocks of the same program (internal call) or processing blocks of other ABAP programs (external call).

Calling procedures directly.

Calling event handlers indirectly by triggering events from the same class in methods. This provides the interface of the event handler. Prerequisite for the execution of an event handler is its registration .

Calling event blocks indirectly by triggering events in the runtime environment explictly.

The statement MODULE does not call dialog modules in the processing blocks of an ABAP program, however, but in the processing blocks of the dynpro flow logic .