It would be great if coherence could understand where one screen starts and the other finishes, when using dual screens. For example when I try to get a window to go full screen it spans both the my monitors also the taskbar does the same thing.
Coherence on two screens seems to work by making windows think it has one, big wide monitor covering both screens - then masking out the bits of the desktop that don't contain active windows - which explains that behaviour. It doesn't really support "dual" monitors properly (i.e. have them show up as separate screens in windows). Hopefully it will, eventually - coherence is a good stop-gap. Re-positioning the task bar to the left or right edge of the screen can help - its not very happy at the top or bottom of the screen in Coherence.
