In a message dated 05/28/2002 5:44:08 PM !!!First Boot!!!, s.mcclellan@attbi.com writes:

a wire that comes down to a few feet above the deck, on the end of which is a small block (pulley). What is this for?

It's part of a topping lift. The block should have a small line from the boom, through the block and back to the boom to a small cleat.