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ISO/IEC TR 13066:2012 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.