backgrnd proc to dump whole/partial screen to file

[phil morris]

Hi,

I'm wondering if there is a way to write a background process that can
monitor for some key seq (signal?) that would then take over the display
and allow the user to rubberband an area of the screen to dump to a file
as either a bit-map or a postscript file.  Anyone know how to do this
or has already done it?

thanks,

-Phil Morris
 pmorris at bbn.com