Snap is a FKEY, invoked by pressing command-shift-4, that does what
later Mac OS versions do. That is, allowing the user to designate a
portion of the screen to have a picture taken of and being saved -
which is something earlier System 7 versions like 7.1 had not built-in
yet.

Download #1: Snap v.1.1.1, StuffIt 3.6 archive

Not to be mistaken with the 1988 utility [Snap][1] from the Mac
whackers.

Compatibility
Architecture: 68k

Mac II and System 7

  [1]: http://macintoshgarden.org/apps/snap-0