It has 2 pouches for the driver and passenger seat headrests. There is a zipper that runs between the front seats and snaps on the dashboard. There is also a tightening strap that runs to the A-pillar and snaps around on itself and 3 snaps on each door to secure it down. You can unzip the zipper and pull back the tonneau to uncover the driver's seat while leaving the passenger side covered.
I used to run this set-up on my old '94 with the matching bikini top. It was a great set-up, and I have pictures saved somewhere. I'll have to track them down.
BTW, you may have already been talking to my brother Matt, but since I have his truck at my house, I have a brand new, never used, factory full length tonneau for a '94 D-90 sitting here at my house. PM for details.
P.S.- Not my truck, but I found this pic by doing a quick search of the site...hope it helps!