Another simple model is the read-only application. A read-only application is one that opens several concurrent read-only frames from the control frame. This lets end users have several concurrent frames for display purposes.

To open each of the read-only frames, use the openframe statement from the control frame. Because end users are not changing information about the child frames, you need not worry about communicating with the parent frame. However, you may want the parent frame to track when each child frame is opened to ensure that end users do not open the same frame more than once.