TkXext "has the ability to send events to any window, embed windows in Tk, and send events to embedded or non-embedded windows."  Unlike [Android], it doesn't yet (as of September 2001) have capabilities for event recording and gathering information about the display.

[GPS] maintains TkXext at http://www.xmission.com/~georgeps/tkxext/ , with the help of several others.

TkXext is X-based; it's available only for Unix.

(more accurately, it's available as source, and good luck figuring out how to compile it under windows to work with Exceed [http://www.hummingbird.com/products/nc/exceed/] or Reflections/X... But if you do work it out, by all means let George know about it.)

[GPS]: I didn't hear from you about any problems.  I'd be glad to help you, so please let me know what problems you ran into with Exceed or Reflections/X.  BTW I'll add a configure option for X11 header and library directories, because I would imagine you have problems related to that.  When I originally wrote the configure script I didn't plan on supporting many systems.