Catsphiddle: we're not disagreeing. I know folk fiddlers often say "double-stopping " for any kind of two-string playing. I was just pointing out that in legit/classica/ music school talk, double-stopping means both strings "stopped" (ie with a finger down on it, the exact opposite of "open"). So, playing on two open strings is the opposite of double-stopping, technically speaking, to someone from a non-folk background.