Typing
The art of typing a dash - "Readers need to be able to tell the difference between hyphens and dashes because these two pieces of punctuation serve different purposes. Here are some guidelines for typing hyphens and dashes so that readers can interpret them clearly." (119 visits)
http://wps.ablongman.com/long_faigley_penguinhb_1/0,7325,505984-,00.html