Thanks, Ath. They are some of the apps I was referring to - but there are more generic ones (at least one I know of) that will make the iPad behave like a secondary monitor - but crucially, without touch capabilities (though, touch is promised in the "future").
For me, as a typically DC'er, I want custom layouts for buttons and what they do. I'll happily use lots of Photoshop (and other programs) keyboard shortcuts but there are always a couple of dozen that I forget where I've positioned them on my macro keypad. Hence, the desire to use something like WinButtons and a mini touchscreen.
I'm quite amazed we've not seen something manufactured by now, something that does exactly what thousands (if not millions) of people could benefit from instantly. That is a touchscreen with customisable button layouts and the intelligence to adapt to the program that has focus. So far, I only see WinButtons getting near to these requirements.
The iPad Keypad Pro app almost fits the bill, but it's on an iPad (so, not as convenient as a permanent touchscreen) and it doesn't allow for "pretty" buttons - which I think are essential when dealing with a GUI that will automatically change with the program in focus; in other words, touchpad buttons have to be immediately identifiable otherwise the user may as well just memorise keyboard shortcuts.
I hope that WinButtons will work with the touchscreen I get, or if there are minor issues I hope we can find solutions to them. And, that means, WinButtons will, potentially, be an essential program for thousands of people.
(Maybe I just get carried away to easily, but, honestly, isn't a touchscreen that responds to your exact program needs an absolutely brilliant peripheral to have - it's the future, well, Star Trek has them.)