VMD uses several different GUI forms, each designed to control a specific aspect of the molecular display (e.g., to control the appearance of the graphics display window, or to change the colors of displayed objects). Each form has a unique name, includes a button with the name of the form near the top of the window. Pressing this button will hide the form from view. The following sections give a brief description of the forms available in VMD; the remaining chapters in this manual describe the actions which these forms make available in greater detail.