Can somebody explain how StackOverflow search works? I would like to add same features to a project I'm working on.

In SO, it's possible to filter the questions by multiple tags (e.g. c#, java) and get results sorted/paged by date or number of votes?

I realize that RDBMS with full-text engine can be used to filter and sort the questions but I'm not sure if that's the best solution? 

Is it possible to somehow get top N ordered results from a full-text index?

Maybe Lucene.NET or Redis or something similar is used?


Question: Export Resolution in Adobe Illustrator
Answer: Illustrator has really no pixel unit, what ot does is it equates pixels with points. Sine a point is 1/72 th of an inch you get one pixel is one pixel with  72 ppi export. Otherwise illustrator will just assume your image in inches and act accordingly.