I am wanting to write a small program that will pop-up a window with a
message in it. Ideally I would like this to be customisable, so I am
thinking of using an HTML format if I can. Is the rendering engine used
by IE available to applications? The idea being is if I could embed and
IE rendering component into my window, then I could offload the work to
that, instead of trying to recreate the wheel.

Any help would be appreciated - Thanks.