"Page 111"
Fair point, must get new eyeballs.....
Strangely I have never actually looked at the screen shot on that page. Those specific functions are not mentioned in the list that follows even though the related + and - functions are there!
Actually they are there, but you have to scroll down quite a ways to find them. I must admit I didn't look at this before the question came up; I found it myself on the keyboard, I suppose because it was so important to me.