Doug,

A Main Tops'l it will never be. A main Tops'l is flown from the main
mast, above the main sail.

It is a Staysail, it uses the stay between the tips of the masts. That
is kind of like "No Mans Land." That stay is the Main mast back stay and
at the same time the Mizzen Masts fore stay, on a Ketch's rig. That is
why it got a name all it's own. It is a "Mule"


http://community.webtv.net/tassail/ILLDRINKTOTHAT