What If - something happens ...
The 'what if' overlay lets you see the likely
distortion caused to the share price should a
certain type of event happen, i.e. the likely
size and direction of any share price 'jump' in
response to news.
The usefulness of this is to identify events which could lead to a trade moving from being 'on-track' to becoming, off-track, i.e., moving from a GREEN trade alarm region into a RED region. Thus, it tells the user what she needs to look out for among the news feeds.