Question: How many apps did the WIndows 8.1 update allow to be snapped onto a signular display?
Sentence: The upgrade addressed a number of criticisms faced by Windows 8 upon its release, with additional customization options for the Start screen, the restoration of a visible Start button on the desktop, the ability to snap up to four apps on a single display, and the ability to boot to the desktop instead of the Start screen.
Answer in sentence: yes