A query can request user interface information from a user interface element hierarchy. Calls from a client program seeking user interface information related target user interface can be handled by a broker module. The broker module can operate across process boundaries and assemble efficient high-level user interface information queries to reduce the number of cross-process calls needed to collect the user interface information. Reducing the number of cross-process calls can result in better performance through improved speed of response to queries seeking user interface information across process boundaries.