Even with the pictures of the windows in the ASAT I'm having a hard time visualizing them. I'm pretty sure I can see that the shoot through mesh velcros in (big no-no for me) but what I can't tell is how the window flap itsef actually opens and closes. I can see the hook at the top but is that the only way it is help up or does it actually zip up like all the other Ameristep/eastman blinds?