In hypertext systems, especially on the World Wide Web, references to other pages or sites are referred to as links. Text segments, or also images and other graphic elements, have links of this kind, which can be followed by clicking on them with the mouse. In texts, links are generally indicated by a special type format. Otherwise, a link can be recognized by the fact that the cursor changes (usually into a pointing hand) when positioned on it. In modern word processing programs, it is also possible to define links in normal texts that refer to other, locally available files or Internet sites.