I have to hand it to that cat, she is fiendishly (felinedishly?) intelligent and really does sit and figure things out. While I was writing my last post, she came bounding up the stairs and began wowling for attention and purring loudly.
I ignored her, apart from a brief ruffle of her forehead fur, and thought she'd gone. Then suddenly I felt it! A needle-like claw in my behind. The little madam had pussy-footed around to the back of my typing chair and had poked her paw under the arm rest and given me a good prod. That'll teach me to ignore a cat when it's talking to me!