Security Safety Lock, Wide

I have a patio sliding screen door with three doors and want to lock door to door, I purchased a window sash lock from Swisco and installed it but it only holds the door together in one direction. Can you recommend a lock to hold the doors together while sliding or locking from inside. ... (cont.)

I would like to install the OKNA sliding patio door foot lock on my OKNA door. I would feel safer with it. Can I buy it?

Trying to find a replacement for one of these plastic locks for hurricane doors The lock is approximately 3 inches top to bottom see pics

I have another question. I have 2 exterior sliding glass doors. Both were installed with the sliding door on the outside. This keeps me from using the normal security of using a board to keep the door from being opened from the outside. I am wondering if there is any hardware I could purchase fro ... (cont.)

slip plate at the top of sliding glass doors that works in connection with child safety handleOur sliding glass doors have a separate handle on them that must be pulled down to release the door. The handle in turn, through a cable, pulls down a metal flange that fits into the slip plate shown above ... (cont.)