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This awesome tool doesn't kill the processes, but it can hide all windows using a hotkey you assign.
WatchCat
This awesome tool doesn't kill the processes, but it can hide all windows using a hotkey you assign.
WatchCat
You could try to program your own shortcut with AutoHotkey - Free Mouse and Keyboard Macro Program with Hotkeys and AutoText
I have used a freeware program called CloseAll. It closed all open programs as soon as you hit the shortcut.