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english

	ENGINE.previous_displayed_screen = ARRAY

		

	ENGINE.display_screen = FUNCTION (screen, remember_old_screen)

		if screen.structure_type != UNDEFINED && screen != displayed_screen

			if remember_old_screen

				previous_displayed_screen[] = displayed_screen

			displayed_screen = screen

// debug start

			debug("displayed screen history")

			LOCAL.i = previous_displayed_screen.size - 1

			while i >= 0

				debug("  " + previous_displayed_screen[i].title)

				i = i - 1

// debug end

			repaint()



	ENGINE.display_previous_screen = FUNCTION

		if previous_displayed_screen.size > 0

			displayed_screen = delete(previous_displayed_screen, previous_displayed_screen.size-1)

// debug start

			debug("displayed screen history")

			LOCAL.i = previous_displayed_screen.size - 1

			while i >= 0

				debug("  " + previous_displayed_screen[i].title)

				i = i - 1

// debug end

			repaint()



	ENGINE.get_previous_screen = FUNCTION

		if previous_displayed_screen.size > 0

			return_value = previous_displayed_screen[previous_displayed_screen.size-1]