Contexts
Every Web Dynpro controller has exactly one hierarchical data storage area known as its controller context.
Before any data can be stored in the context at runtime, metadata must first be created that describes the runtime data. The creation of context metadata is often done at design time, but can also be done dynamically at runtime.
The data held in the context exists only for the lifespan of the controller. Once the controller instance has been terminated, all data held within its context is lost.
Data Visibility
Although each Web Dynpro controller cannot function in isolation from the Web Dynpro component within which it has been defined, each controller is nonetheless an independent program. Consequently, controllers do not normally have access to each other’s data or functionality.
In order for two controllers to be able to share data with each other, one controller must expose its context through its public interface.
More Information
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Creating Context Trees
Manually