1. A system comprising: a database system associated with a first application accessible from a first data network domain, the database system accessible by a client machine capable of displaying a user interface comprising a first user interface component for the first application and a second user interface component for a second application accessible from a second data network domain, the first and second user interface components configured to display data associated with database records stored in a database associated with the database system; and database system software stored on a non-transitory computer-readable medium for execution by one or more processors, the database system software configurable to cause: processing an indication of a first event message sent from the second user interface component to the first user interface component via a communication channel between the second user interface component and the first user interface component, the first event message comprising a request to perform a first operation comprising displaying data stored in a designated one of the database records; identifying, for the first application, a first one or more data network domains designated as trusted; 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 by at least: determining that the first operation does not comprise manipulation of the data stored in the designated database record, and determining that the first operation comprises changing an appearance of the user interface; and responsive to determining that the first one or more trusted data network domains comprises the second data network domain and determining that the first operation is a safe operation, permitting performance of the first operation.