Sending IOU's from Ripple Desktop Wallet

[SGerald]

Hello all. I apologize in advance if this question is in the wrong place or repetitive...I'm new and, frankly, not really sure where to put this question in the context of the available topics. 

So I've experimented by buying a basket of IOU's representing different currencies and even bitcoin by using https://www.theworldexchange.net ledger interface, and now I have them just sitting in my XRP wallet. So I understand obviously how to send XRP from wallets to exchanges and such, that's simple...but I don't see any option for these IOU's. I see each has its' own unique address that I assume I could send to, and I guess that's another question. Exchanges: Which ones support and will redeem IOU's representing Dollars, Yen or Bitcoin for example? How can I send these IOU's properly from wallet to wallet? How will I know what addresses to use? How will I know they will be "honored" by the exchange? Is there anything special I need to do with the destination tag or invoice ID? If I send real bitcoin to an IOU address, will the ledger understand what to do, or would that get me screwed? (Not that I want to use Bitcoin, but this is for science.) 

 

If the question is repetitive I hope you'll be gentle with me and guide me to the proper resources. Thanks in advance!