Comment #1 on issue 3586 by guillerm...@gmail.com: Rename color buttons in MouseEvent http://code.google.com/p/pharo/issues/detail?id=3586 Here is a squeak wiki post about colored mouse buttons: http://wiki.squeak.org/squeak/897 And the part that says "The Smalltalk image from which Squeak is derived was designed to run with a three-button mouse on an Alto or Dorado computer. These buttons were known as the Red button, Yellow button, and Blue button, and some mice on the Parc computers really had buttons of these colors." allows me to think that originally, the buttons were named just like the hardware :). So calling them left, right and middle... Is right the same but more meaningful. Another classification there puts them as: red:primary yellow:secondary blue:meta, tertiary So we could call them primary, secondary and (tertiary or meta). I like it :). Cheers, Guille