highfigh, if your comment zeroes in on some phrase or sentence in the top post of a thread, that's a reason to quote an excerpt of the top post. If your comment simply stays on topic, there's no reason to quote the entire top post. You're on the subject. We get that.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
