Ctrl + click is the only combination needed for right clicking. This provides a context menu in most situations. This has worked for as long as I can remember.

Ctrl + click is the only combination needed for right clicking. This provides a context menu in most situations. This has worked for as long as I can remember. Two button mice have also worked for a long time. The newest Apple mouse has two "buttons" in fact, but this functionality is not enabled by default.