Although it was not very popular when it came out, it had a feature called "WYSIWYG" (What You See Is What You Get), which meant that people can change the visual style of writing (e.g. bold, italics), by clicking on buttons, when in other programs like WordPerfect, people had to add special 'codes' to change the style of writing. "WYSIWYG" is now a common feature of all computer writing programs.