User Interfaces For Touch Screens?

BSemrad asks: "I am writing a large application that must run on a normal desktop PC and in an industrial environment (again on a PC) using only a touch screen for input. I am looking for suggestions on Widget/UI toolkits that make it possible to write an application where the fonts and controls are expanded by about 200% for the touch screen environment and are normal sized for the desktop environment. Using dynamic sizing for dialogs and screen controls this should be possible, shouldn't it?"