I'm following a Blender book on character creation. It mentions about clicking on Copy Pose and Paste Inverted Pose buttons on the header. I'm guessing it's referring to on the Dope Sheet, which I have open in a separate partition. Either way, I'm not seeing those buttons anywhere and the buttons I thought were them don't do the job properly, but copy/paste the keyframes to the copy/paste buffer.
Do these buttons exist? If so, where are they?