Provides an overview to the structure and terminology of the IAccessible2 accessibility API. It provides: a description of the overall architecture and terminology of the API; further introductory explanations regarding the content and use of the API beyond those found in Annex A of ISO/IEC 13066-1; an overview of the main properties, including: of user interface elements, of how to get and set focus, of communication mechanisms in the API; a discussion of design considerations for the API (e.g. pointers to external sources of information on accessibility guidance related to using the API); information on extending the API (and where this is appropriate); an introduction to the programming interface of the API (including pointers to external sources of information). It provides this information as an introduction to the IAccessible2 API to assist: IT system level developers who create custom controls and/or interface to them; AT developers involved in programming "hardware to software" and "software to software" interactions.
