[Rhodes22-list] Boom Room? help

[PBR]

My boat came with a canvas piece that would seem to attach (tie) to the Mast
and also a screen portion for sides.  There is velcro along the outer edges
of the top piece.  The top piece is wider at one end than the other.

Does anyone have this setup that can help with a few simple instructions on
how to set it up?
Was there originally any poles to give it shape or does it somehow just
attach to shrouds & stays?

-Patrick