RE:Nasdaq onlyYes they can. Just got off the line to RBC in Toronto and they inform me if your invested in Canadian dollars everything will stay the same with quotes and trades in Canadian dollars if you want but you have the option of opening a USD acct of course. Everything will stay the same in RRSPs and TFSAs but if they(heaven forbid) delist from the DAQ and use OTC exchanges you would have to liquidate your holdings because they're only valid in registered exchanges. So in summary, no sweat in the Arctic. Business as usual.