�1���� Scope
�2����
References
�3����
Terms and definitions
�4����
Abbreviations
�5����
Interactivity and the role of interaction paths
�6����
Reference model for the interaction channel
�7����
Specification of the broadcast channel
�8����
Specification of the interaction channel
������� 8.1���� Interaction channel transport mechanisms
������� 8.2���� Interaction channel characteristics
�9����
Management functions
Appendix I� �� Technical parameters under study