As it stands, neither Boost nor C++ has any support for GUI applications. Therefore I am suggesting a library that provides the bare minimum required to create a GUI application. My thoughts on what this library would contain are as follows: - Types for controls (contexts bound to the extent of their parent) and windows (contexts that remain separate from their parents). - An event handler class that is passed when controls and windows are created that contains all information needed to handle events for the new context. - Functions for generating events (if applicable) and (a) function(s) to initiate message handling (unless the event loop is run in its own thread like in Java). - Functions to access and manipulate the data of the contexts (size, position, z-order, ect). - Miscellaneous other types used for support (such as for screen positions). - A way to retrieve the native concept of a window/control. As you can see, there are no controls/widgets/ect defined, either from the library or using the native versions. Such things can be added later, if people can ever agree on how they should be implemented. It needs a lot of refining, but I believe this covers the *minimum* support that is needed for a GUI.