Thanks to all for the helpful information. A follow up question. On a boat set up for single handed sailing how does one secure the mainsail to the boom when reefing the sail. Do you have to leave the cockpit and to secure the main to the boom or can a winch handle that?
There are lots of different setups for reefing.
On my boat I have a two line reefing system (one for the tack and one for the boom end). Both are led back through clutches to the winches on the coach roof (one on each side).
Each coach roof winch can be used on several lines by help of the clutches.