This is useful if only what is printed is of interest. This can be used to capture the marked up version of the input for other uses. The directory in which to create any temporary files for use with either browser. The default depends on the browser in use. 10 minutes is the default.
Most usages fall into two categories.
The textual pattern matching used to identify URLs, FTP locations, mail addresses, header newsgroups, news article IDs, and filesystem pathnames is completely heuristic and can easily misidentify items. Also, if the input text is exceptionally large, the pattern matching can become prohibitively expensive to compute.