IAccessible2 is an accessibility API for Microsoft Windows applications. Initially developed by IBM under the codename Project Missouri,[1] IAccessible2 has been placed under the aegis of the Free Standards Group, now part of the Linux Foundation.[2] It has been positioned as an alternative to Microsoft's new UI Automation API.
While UI Automation is trumpeted as "royalty-free",[3] IAccessible2 claims to be an "open standard".