how does getref work??

What you are asking is basically everything about how Getref works. I would suggest that you start by reading in the forum, there are much information there about other questions people have had in the help forum, and general information in the general forum. Also it would help to read the FAQ and the "how to" sections, since they have most information about what you can do and how to. Then if there is still something you do not understand you can ask more specific question in the Getref forum.