Activities
- Multimodal Interaction Framework:
  
    - how different modalities are integrated into web pages
- interaction management
- persistent information within a session
- information about environment and system
 
  - Extensible MultiModal Annotation (EMMA) for annotating user input (I
    want to go to Boston --> <destination>boston</destination>)
  - Ink markup for representing pen input (gestures, handwriting, drawings, chemical,
    mathematical and musical notation)