Even Windows 3.11, NT 3.51 did this... and my Atari ST... probably windows 1.0 even because a mouse was not always guaranteed to be attached and/or working on early PC's. In my case in the mid 90's I remember I sacrificed the serial port the mouse was attached to run another modem for dial-in access to our officer on NT 3.51 server... THAT tought me fast how to get around a windows desktop with the keyboard - and it impressed me you could access everything - switching windows, menus, etc without getting "stuck" . With a mac, your computer would be useless, or at best infuriating (ie using some plug in to slowly nudge the pointer around the screen with arrow keys....)