##
helpFrame.visible()

    h.visible(true | false | () )

Like all functions of this kind, the "visible()" method can be called in three ways: without a parameter, in which case it returns the actual visibility of the helpFrame as a boolean, or with one parameter: true or false, in which case it makes the helpFrame visible or invisible. Toggling visibility can be done by

    h.visible ( ! h.visible() )

An invisible helpFrame can be used to steer the application programmatically or by menu buttons.