The animation of the window is performed by an animation DLL that plugs-in to the Window Server. The message window class is a client-side animation class, derived from the animation client-side class RAnim.
The API is used by such higher-level APIs and device-family specific UIs to provide information and message windows. Such APIs would normally be used by client applications, but this API can be used to implement specialist new types of message window.
A message window is provided by RMessageWindow. The window's font and colors for background, text, border and plinth can be configured.