A Web browser is simply a terminal emulator，designed to display text on a screen．The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with(71)．and that it has a mechanism for(72)graphical files．Display text，display graphics，and (73) hyperlinks--there's 99 percent of the(74) value．That's not to say that the manufacturers didn't go all—out to attach a hyperactive efflorescence of useless capabilities onto their browsers．Remember when media channels in the browser were a big deal，instead of the clutter youcan-t wait to delete from your favorites of bookmarks menu?Remember when client-side Java applets were supposed to become the preferred(75)for application development?Remember frames and all their nasty side effects?