You may already know how to enable the Emoji keyboard in iOS so you can use it in the Messages app on your iPhone or iPad, but did you know you can also access and use the same Emoji characters in Messages on OS X? In most Mac apps, including Messages, simply go to the Edit menu and choose Special Characters, or press OPT+CMD+T, to bring up the Characters pallet; you can access all of the same Emoji characters as on iOS, organized by category, simply…