This is one of the most ancient and authentic Prashnottari's available. This should be used only when there is a natural anxiety to know about something. While using the same, you should have a clear question in your mind. You may not happen to receive a positive/clear response to an ambiguous question.
For getting an answer for your query, repeat the question in your mind and then click on any one of the box ("Kostak") after closing your eyes. The result to the query will immediately appear on the screen.
Remember your God and click on the square of your choice to get the answer for the question in your mind.