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The GNOME desktop provides a single menu of all the desktop-wide preferences and system administration settings. Preferences and settings dialogs can be placed in this menu to make them easily accessible. Dialogs can be placed in the preferences menu by adding them to the applications registry with the Setting category. Dialogs can be placed in the administration menu using both the Settings and System categories.
If you provide a dialog that allows administrators to configure desktop systems, then you should add your dialog to the administration menu. If you provide a dialog that allows users to adjust preferences that affect a number of applications, then you should add your dialog to the preferences menu. You should not use these global menus for individual application preferences.