1. A system comprising: one or more servers of a database system hosting a first application from a first data network domain, the one or more servers in communication with a client machine configured to display a user interface comprising a first user interface component for the first application and a second user interface component for a second application hosted from a second data network domain, the first and second user interface components configured to display data associated with database records stored in the database system; and database system software stored on a tangible medium for the one or more servers, the database system software operable to cause: receiving an indication of a first event message sent from the second user interface component to the first user interface component, the first event message comprising a request to perform a first operation; identifying a first one or more trusted data network domains for the first application; determining that the first one or more trusted data network domains comprises the second data network domain; determining that the first operation is a safe operation; and performing the first operation.