This is a collection of Racket GUI widgets for creating presentation-based interfaces, in which there is a link between information on a screen and an underlying semantic object. GUI commands can act on presented objects, and highlights are provided to show when two objects are equal.
For a demo, check this code out and then run:
$ racket repl.rkt
In the resulting window, evaluate:
> #((1 2 3) 1 2 (3 (4 5)))
Mouse over different parts of the result, and see equal things light up. Right-click the whole result, and select "Inspect value". Scrub the mouse around the resulting window, and note how correspondences between the various objects are highlighted.
