The zoom, rotate, pan, and other mouse actions available for manipulating the viewer in user interface mode perform identical functions in the viewer in line interface mode. In addition to this, hotkeys can be used to manipulate other aspects of the viewer. For a full list of all the hotkeys available click in the viewer to make it the active window and select the ? icon. To execute a hotkey command, click once in the viewer (or on the object, as some functions are object-specific) and type the command.