Hi periodical. I have always wondered about the same thing, as I'm passionate about medical missionary work. I couldn't find too much information on the subject either, until a few months ago, one new traveller nurse showed up. Anyways... we were all thinking she was English (accent let it out LOL) with a permit to work in US, or maybe a legal permanent resident ... BUT NO, she is a nurse, actually, a nurse mid-wife, however, she doesn't like to function as such in USA, only when she goes abroad. I was waiting to become more friends and start asking questions...when her time was up and she went to frigging "Bahamas" for a contract of 12 weeks...... ?! I thought really? Seriously? Lol BUT, BUT.... she came back! She said she kinda liked out hospital... go figure.... anyways... she explained to me that it's a "international nursing license". We do have to sit for another test, yes, and she also said that it's one extremely hard, all discursive questions....and we can only work in those countries inside the agreement of whatever... I guess it work just like our license here and the states that will accept it.
I know that it's been a year you posted... so if you found more info than this please contact me and if not, I will try to find more with her too. She works at a very busy floor, me too (separate floors) and everytime I decide to ask such questions ppl around decide they wanna talk to her too and about blah blah blah.... arrgrrr LOL