Multiple Orgasm Questions

[nroboy.livejournal.com]

Hi everyone.  I wanted to find out more about something I've been curious about for a while now -- multiple orgasms!  I'm wondering a few things, and I'm hoping some of you ladies wouldn't mind spilling your guts.  I already asked this over at sextips, but I thought I might get some other perspectives here.  Thanks!

How many females out there can have them?
When you have them, do the ones after the first feel different than the first one?
Do they feel different from 'one big orgasm'?
What's the most you can have in one session?
How long do they last?
Did you have to learn how to have multiple orgasms?  If so, how did you learn?
For those that have multiple orgasms, do you need to have more than one to feel satisfied?

I'm basically interested because I'm curious :).  The more details, the better!  Thanks!