On dual monitor system (Windows 7 / 64, the two monitors do not have the same size):
1) set PI to 'Windows full screen' (using the Windows full screen button), it extends to the current monitor as expected.
2) Toggle View / Full screen : ok (remove windows decoration on the current monitor), can be toggled on and off between PI Full screen and Windows full screen.
3) When in 'pi full screen' mode, select View/Full Desktop: OK (use both monitors as expected)
4) The problem: Then View/Full screen acts as a toggle between the 'PI Full screen' and 'PI Full desk top' modes. I have not found a way to come back to 'Windows full screen' mode other than exit PI.
Full Desk top should probably act as a toggle, and full screen should work as expected when we are not in ful desktop mode.
This (not very severe) problem was found when I tried to find a way to have a true 'full screen' presentation of the image.
[ EDIT: In fact this bug was already reported (but not answered) at
http://pixinsight.com/forum/index.php?topic=2726.msg18367#msg18367).]
-- bitli