GNOME application writers use DocBook (a particular set of XML tag definitions) to mark up their documentation. Then as part of the installation process this online documentation is stored in a central location on the computer with other GNOME documenation and registered with the Scrollkeeper documentation management system. The appropriate help is brought up automatically when the user selects the 'Help' main menu item in a standard GNOME application. An API exists so that appplications can also manually load certain help pages, allowing for context sensitive help.