extracting stereo information - unique left/unique right/shared

terminal velocity

Hey fellows. I'm looking for a program or plugin (or even a simple method) of taking a stereo .wav and seperating it into 3 files or tracks.

Audio unique to the left channel
Audio unique to the right channel
Audio that is shared between the two channels

I know that there's a way to eliminate shared audio (aka 'reduce vocals'), but that's not what I'm trying to do. Thanks!