I've heard of it happening. It's just about the same as a G-Spot and clitoral orgasm at the same time which I think would be easier to achieve, but it depends on the person.

I think I've had a G-Spot and clitoral orgasm at the same time, but I haven't had both an anal and clitoral at the same time. It's just a matter of stimulating those parts till they can't take any more.

Hmmm, I'm not sure. I've had orgasms while stimulating different parts, but I just think of it as all one thing. Probably it's all clitoral orgasms for me though because I almost always need my clit involved in order to cum.

Absolutely. One term often used is a 'blended orgasm'. For my wife this is when she has a g-spot or a-spot orgasm at the same time as her clitoral orgasm. She hasn't yet had an anal orgasm - so I can't comment on that.

Yes I can have vaginal and clitoral at the same time and it feels amazing

I haven't had it but I'm sure it's possible.