The navigation-control and navigation panes work together. Normally they provide four navigation features: Contents, Index, Search, and Related topics (ALinks). However, if some of these are inappropriate to a particular OmniHelp project, the unwanted features can be removed with .ohx variables useNavToc, useNavIdx, useNavFts, and useNavRel. All four variables are normally set to true; if one is set to false, the corresponding navigation feature is disabled, and the name of the feature does not appear as a tab in the top row of the navigation-control table. The cells for the remaining features are widened to compensate. OmniHelp does not load the data file for the deselected feature, ohctrl.htm does not load the corresponding JavaScript code file, and the omitted feature is ignored when subprojects are merged. If Mif2Go is used to generate OmniHelp, these settings are made in configuration file mif2htm.ini.