whatIf? Wiki

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Many views require that a history be selected (if running in a simulator) and/or a background scenario be picked in. In these cases a section of code near the top of the view - following the object declarations - is used to check that the required history and/or background is in place. If not in place the code advises the user and quits.

Common code sections are listed below.

Simulator - history and background required

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