Photos: The mouse (and even better ideas) that roared 40 years ago

In the demo, Engelbart's keyboard is flanked by a mouse and a "keyset" that could input characters. For example, the left hand might type out DW for "delete word" on the command line using the keyset or the keyboard. The right hand would direct the mouse to the word to be deleted. Clicking once on the mouse button selected the word by putting an arrow under it; a second click executed the delete command.

Photo by Scott Ard/CNET Networks

Caption by Scott Ard