To click twice. In order to highlight a word in a word processing program, for example, you must place your cursor on top of the word and double-click quickly. Fortunately, when you browse the Web and click on a link, you only have to click once (likewise, some operating systems can be configured this way as well). When you're new at this, you may not know whether to click once or twice; usually, when you're working inside a computer application, you must double-click, but when you're on the Web or when you "hit OK" or submit information on a form, you single-click. A tech support person may say, for example, "Do you see the icon on your desktop? OK, double-click on that."
NetLingo Classification: Technical Terms