The manual may be downloaded various formats from the Download Page . Explain the help-system briefly. Show help-page on topic. When using XPCE , these predicates start a GUI-based manual tool with hypertext capabilities. The index is updated every night.
Good news is that there is a better mode today.
For more information, see the Twiki Web on SWI-Prolog . Various parts of this environment already exist and are being used actively. In the future, these tools will be enhanced. We intend to allow the user selecting preferred tools and combining them with whatever they like. This section lists links of general interest to Prolog users, but mostly specific to SWI-Prolog.