PS:
Note, since the discussion section (below) to the question arose:
Is the tent be completely closed?
Yes!
The tent is completely closed off. - There are 6 parts with "arched" window, and two parts with no windows.
So overall 8 side "walls".
These can be mounted to open Gusto. Standard mounting would be the longitudinal sides (3 each) with windows, and the two end faces 3 meter (1 each) with no windows.
But, as I said, this can be varied according to taste.
In the dealer-information is available (as of 28/05/2011):
"Party tent, with 6 sides with windows at the front u. Back. The pavilion can be mounted compl. Closed or partly open."
This is confusing, in fact, when one sees that the complete closure of 8 parts are required.
Unique and clear it would be the seller, or have been manufacturers, to write:
"Party tent, with 8 sides. Of these, 6 windows and 2 without windows. Total 8. So be completely closed."