A while ago I found myself staring for minutes at a command full of functions that didn't behave like I expected. And this time I was confident that the command was right ... (that doesn't happen very often) This had to be a bug! After a break I finally saw the "!" I overlooked all this time in an %@EVAL function. That led to this function: Code: function NOT=`%@eval[!%$]` Not very complicated, but "%@NOT[....]" is harder to overlook than "!"