I am a sad puppy. I'm not the rudest person on MobileRead anymore.

Seriously, how did that guy ever get sand
there?
I think we can all agree that the OP is an ignoramus, a moron, and a troll. However, I'd like to remind people that if anyone has
legitimate calibre questions, instead of frothing, spittle-blowing, vaguely incoherent rants, please bring them over to the calibre forum. It's full of nice people who are happy to help out (and me). There are few if any calibre problems, or problems that might be solved by the use of calibre, that someone there can't pop out an answer for. The calibre forum is right down the list a bit, suitably named.
As for the OP ... when I found that it was "ebook library management" that he couldn't understand, I was reminded of the story that ends "...and send it back. You're not smart enough to own a computer." If someone doesn't know what an ebook library is, or why one might want to manage it, I have to question that person's ability to read ebooks at all.