As an X Window application, the output of this program can be displayed only on an X terminal or on a workstation that is running an X based windowing system (such as DECwindows.)
See the section on customizing colors for a description of how colors are represented on monchrome and grayscale monitors.
An option menu is a push button with a label next to it that causes a menu to be displayed when you press the left mouse button over the button part. The item most recently selected from this menu is displayed inside the button. The button has a little ``handle'' on its right side to distinguish it from an ordinary push button.

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