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Many views require that a history be selected (if running in a simulator) and/or a background scenario picked in. In these cases a section of code near the top of the view is used to check that the required history and/or background is in place.
Common code sections are listed below.
boolean $answer if $history == false say ("This view requires a history.") listen (" enter to continue >> ",$answer) quit (-1) endif if $background == false say ("This view requires a background scenario.") listen (" enter to continue >> ",$answer) quit (-1) endif