color probe (at a point)

[Ronald Swartz]

How would one determine (or return) the color at a point on the screen, 
under script control of course.  I would like it to be something like:

get the tcolor at 340,230      (where I just made up the name "tcolor.")

Is there any easy way to do this.  I am working on something which 
requires me to poll the points in the neighborhood of a screen point 
and cannot see anything in revolution which would provide that tool.  
Help would be appreciated.

Ron Swartz
tetraron at comcast.net