Ok guys, I just spent an hour trying to find something which explains this kind of command and am right back where I started. I'm going to switch off my brain for a while and try again later. If you have any suggested search parameters I can use with Google to find helpful info I'd appreciate it. I don't seem to be getting very far on my own, my feeble brain just isn't absorbing things as well as it once did, I'm afraid.
Thanks!