Context-sensitive help is focused user assistance content, specific to the
           current application context (that is, the help context), and presented on demand 
           when a platform-specific trigger is activated (for example, F1 on Windows).
        
        
        Context-sensitive help requires interactions between user interface (UI)
           components, user assistance (UA) components, and the Eclipse platform help
           system.
        
        UI components:
            
                - Contribute UI controls
- Define the association of help contexts with UI controls
UA components:
            
                - Contribute context-specific help content and online documentation content
- Define the association of help contexts with context-specific help content and
                related online documentation topics
Eclipse help system:
            
                - Resolves help context references to matching context-specific help
                    contributions
- Contributes the help presentation mechanisms (for example, the Help view)
- Provides API to enable context-sensitive help interactions for UI and UA
                    components