Thanks, m3TTwUrsT:)
Unfortunately, the script doesn't help much; it makes the screen flash black periodically (presumably each time the WinVICE window recieves a command to maximize), and when I quit I still see a short flash of a smaller window before WinVICE closes down.
I've been doing some research; the AutoHotkey command "Gui" is supposedly able to create a new, all black window, for instance like this:
^k::
Gui, -Border -Caption +AlwaysOnTop
Gui, Color, Black
Gui, Show, x0 y0 w%A_ScreenWidth% h%A_ScreenHeight%, Example
return
Seems like I could put the above before a command to close the WinVice window (which would then close behind the black window), and then remove the black window. Problem is, I can't get the Gui-command to work while WinVice is running. When I run the above nothing happens, at least the window that's supposed to show up isn't anywhere to be seen.
Edit: I tried running it after first collapsing WinVice from full screen to a smaller window with alt+d, and doing so, the black Gui-window was able to be triggered. When in full screen, though, nothing visible happens, although I've noticed I have to press esc before WinVICE will respond to commands (indicating perhaps that a new but invicible window is hopvering above it and needs to be quit?)
Hm, maybe this isn't noob-stuff... maybe I'll go ask on the Autohotkey-forums.