Use this page of the Options dialog box to specify what Help sources you intend to use for Help searches and F1. You can access this dialog box by clicking Options on the Tools menu, moving to Help in the Environment folder, and then clicking Online. If the Online page does not appear in the list, select Show all settings in the Options dialog box.
The dialog boxes and menu commands you see might differ from those described in Help depending on your active settings or edition. To change your settings, choose Import and Export Settings on the Tools menu. For more information, see Visual Studio Settings.
These options affect full-text searches. By selecting or clearing a provider, you are adding or removing the provider from the search results list. The order in which providers are listed in Search these providers determines the order in which the search results for the provider are displayed on the Search page in Help.
Help content installed on the local computer.
MSDN Online content on the Web.
Content from partner Web sites selected in the Codezone Community option.
Content from online discussion groups, forums, and so on