Main Panel The Main Panel is the horizontal window at the bottom of the display. It contains a number of controls you use often, including the workspace switch, which lets you change to other workspaces. subpanel If a control in the Main Panel has an arrow button above it, then the control has a subpanel. Subpanels contain additional controls. To display the subpanel, click the arrow. Subpanels always contain: An Install Icon control. Use this control to customize the subpanel. A labelled copy of the control in the Main Panel. Some controls start applications when the control is clicked. Some controls are drop zones&emdash;you can drag a file from File Manager or Application Manager to the control. Others, like the clock, date, and busy light, are indicators. Many of the controls in the Front Panel start applications when you click them&emdash;for example, the File Manager and Style Manager controls. Some controls are drop zones&emdash;for example, the Printer and Trash Can controls. You can drag a file from File Manager or Application Manager to the control. Certain controls, such as the clock and busy light, are indicators that tell you something about the state of your system. Other controls have dual purpose; for example, the Calendar and Mailer controls are both indicators and buttons for starting applications.