Squeak and mice
 
 
Squeak needs 3 buttons; many Mac/Windows machines have fewer
	Windows mappings:		usual meaning:
- Red	left-click		“move/select”
 - Yellow	right-click		“context menu”
 - Blue	ALT + left-click	“window/Morphic menu”
 
See Guzdial p. 42 (or Squeak page linked from course web) for other platforms