Adding Accent Marks in OS X Lion
OS X Lion supports the same method of adding diacritical marks to characters that is found in iOS devices......
1.Open your favorite text editor.
2.Start typing a word or sentence. When you get to a letter that needs an accent mark, continue to hold down the key for that character. After a short pause, a popover window will appear just above the character, displaying all the appropriate accent marks for that character.
3.You can select the accent mark you wish to use by either clicking on the glyph, or entering the number that displays just below each glyph.