Windows applications can offer help to their users by using the WinHelp function to start Windows Help and display topics in the application's help file. The WinHelp function gives a Windows application complete access to the help file, as well as to the menus and commands of Windows Help. Many applications use WinHelp to implement context-sensitive Help. Context-sensitive Help enables users to view topics about specific windows, menus, menu items, and control windows by selecting the item with the keyboard or the mouse. For example, a user can learn about the Open command on the File menu by selecting the command (using the direction keys) and pressing the F1 key.