Configuration:
Host - Fedora 12
Guest - WinXP
VB - 3.2
When I switch to fullscreen/seamless mode in the guest, then I suppose the correct behavior should be that all the normal keyboard input should be directed to the guest (except 'Right Ctrl' - the host key).
In my Window Manager on Fedora 12 (Gnome Metacity), I have plenty of keyboard shortcuts etc. configured for ease. However, these shortcuts should _not_ work when the guest is in full screen mode. Unfortunately they do.
Even Alt+F4 inside a fullscreen guest brings up the "Close VirtualBox" dialog instead of closing the intended app inside the guest. Surprisingly, on enabling compiz, everything works fine. This is a regression since VB 3.1.8 because it worked there.
I do not have a dual monitor setup.
More discussions on this during the BETA feedback process @
http://forums.virtualbox.org/viewtopic.php?f=15&t=30874&sid=3310ef2ed76465abbc47bb7cdcc39695