We're trying to realize the following functionality with a Wacom
Graphire tablet:

  On the tablet the user has a sheet of paper with buttons printed on
  it.  When he clicks on a button, then a script should be started.

  Ideally, there's also an area on the tablet that can be used for scribbling,
  e.g. after starting an appliction such as the Gimp by clicking on a
  certain tablet button (= button drawn on the paper).  However, this
  functionality is not too important at the moment, and I guess it can
  be realized by defining two active areas on the pad.

So, how do we realize the buttons?  At the moment, I see several
solutions:

A Map the tablet to the user's display.  On the display, an application is
  open that shows buttons corresponding to those on the tablet.

  Without surprise, this is not what we want.  The user should be able
  to work with another application in parallel to using the tablet.

B Use the same solution as A, but do everything in a second X-server whose
  display is not shown on the user's monitor.

C Display a very small window on the users display and map the area
  where the window is shown to the tablet.  This solution should work
  AFAIK.  However, the small window on screen may annoy the user.  Also,
  there's the problem that the application probably needs focus in order
  to receive click events.

D Use the same solution as C but display the window off screen.

Is there another possible solution that we should be aware of?  Which of
the above solutions are feasible?

-- 
Felix E. Klee

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