With THE 3.0/3.1RC1 on Win NT/2000, press
ALT+ENTER twice (windowed-->Full Screen-->windowed).
You will not be able to press any more keys (does not
freeze system, only application). This
does not happen on Win 95 with THE 3.1 RC1.
I verified this happens also with the PDCurses "reindeer"
I looked at the keyboard/mouse message handler. I feel
the problem is in 'pdcurs25\win32\pdckbd.c', (probably
an unhandled message disturbs the state table).