Panel (computer Software)
In graphical computer software a panel is "a particular arrangement of information grouped together for presentation to users in a window or pop-up." In ISPF, a panel is "a predefined display image that you see on a display screen.".
A panel widget is commonly packaged as part of a widget toolkit for a graphical user interface. See toolbar and dialog box.
Read more about Panel (computer Software): Panels in Widget Toolkits