When I connect to my UK PC from the US (grrrr) Mac I can usually remember where the different keys live. However, there a couple of keys that regardless of my PC keyboard locale just don’t seem to work from the Mac, namely "|" and "\" (although it works fine from Parallels!?). To get around this I’ve now started using the Accessability feature of the On Screen keyboard. Just remember to set it to the correct number of keys otherwise you still won’t see those characters!