The names of the buttons should be semantic, not color or positional.

Pity the left-handed, color-blind Smalltalkers.

In MVC, <select> <operate> and <window> are the names I think of for the
mouse.
In Morphic, <select> <operate> and <halo> .

Note the strange verbification of the third button for both frameworks.
Or is it a noun :-?