Abstract: A method, program and system for displaying the consequence of an input in a graphical user interface (GUI) are provided. The invention comprises displaying a GUI including a plurality of interaction control mechanisms (controls) having a selected or a deselected state. An input to a first control may cause a change in state to at least one other of the plurality of controls. Responsive to a first input at the first control (e.g., holding down a mouse button with the pointer on the first control), the invention displays a preview of the change in state of the plurality of controls that would occur if a second input is made at the first control (e.g., releasing the mouse button with the pointer still on the first control). If the user does not want the previewed change in state to occur, the user has simply to avoid making the second input (e.g., move the pointer off the first control before releasing the mouse button).

Abstract: A message-driven application is converted to an Application Programming Interface-driven application while retaining the same functionality in a windowing graphical user interface that is inherently message-driven. At minimal application coding expense, an application that send messages to control its windows can be converted such that APIs are called instead to perform the exact same result.

Abstract: A graphical user interface is changed according to a new font for one object in the graphical user interface. The set of appearance parameters are adjusted for the object according to the new font and presenting the object according to the adjusted appearance parameters and the new font. A set of related objects within the interface can also be changed according to the new font, once the new font is established for the object, the set of related objects in the graphical user interface for the object is determined. Then, each respective set of appearance parameters for the set of related objects is adjusted according to its object class and the set of related objects is presented according to their respective appearance parameters and the new font.