Multi Tasking before System5 could only be achieved though special application shells. Here we have an example of Switcher. Which Allowed multiple pieces of software to run in cooperative multitasking.
Its actually pretty cool. When you hit the little arrows in the upper right hand corner the applications slide the same way Full-size apps in the current releases of OSX and IOS will slide to reveal the next app.
It runs remarkably well on this little Macintosh SE