[This is preliminary documentation and subject to change.]
The Location property, retrieved by calling the IAccessible::accLocation method, can provide information that tells the user about the object's function. For example, the Location property for a toolbar button would be the object's bounding rectangle. If the object is a region, then this method returns the biggest rectangle encompassing the entire region.
Note to implementers This method must not fail for visual objects. Currently, the only nonvisual objects are sound objects.