Besides that, the skyhooks mentioned by Tony are just to be used by kitesurfers on a directional strapless board.
The newest hype in kitesurfing is kiting strapless!

But doing so at sea you need to pass the breaking waves and that's where you want to lift the board with your feet. So you squeeze both knees together and take the board with you by the skyhooks as you steer the kite up.

This all has nothing or less to do with catsailing.

Don't kill the Messenger please