Whether is used when you're talking about a situation with two or more alternatives, whereas if is correct when describing a condition with no alternatives. For example.
This tutorial is the result of your requests on the comment field of the first tutorial about DLNA, DLNA there I explained what and how it is used in everyday life to watch[…].
Non-invasive ventilation(NIV) is a medical procedure that is used in situations where the patient's own breathing or can not be limited to certain pathological factors….
Usually it can be used in the front of big marquee tent as reception room or connect several small pagoda tents together to form a large group to meet different request on size and occasions.
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