Subject is just instead of the "small matter of programming" and "simple yet powerful" phrases. Anyhow, to the actual subject:
On some (big expensive professional) sites, when you enter a new question or request for assistance, the system returns a search list of 10 "hits", either of previous posts or of a FAQ. It derives the search terms from the submitted question (presumably, though I do not know for sure, detecting popular search term/words are in the question).
The idea of course is that there is no need to submit the question, saving everybody's time (the would-be-poster gets an instant answer) (And thinking about another related thread - it should always include "BlinkWithoutDelay"