I have this window at home. I feel unsafe as I do not know the latch mechanism. Can someone explain how to shut this window?
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That's a window sash lock. It's designed to prevent someone from defeating the lock from the outside, or prevent a small child from opening it from the inside and falling out. Operates as any normal window sash latch would, only you have the option to lock it with a key as well.
Personally, I consider it a death trap. If locked, there's a fire, and that's your only escape route, you've made a dangerous situation.
Offers piece of mind to some people though.
Move the lever all the way to the left so that the lever is parallel to the glass. In this position the window can't be slid up/down.
Insert the key and turn it 180 degrees. This prevents the lever moving past the keylock.
If you can't move the lever all the way to the left, it is because the key-lock was locked when the lever was in the wrong position, insert the key, turn it 180 degrees to unlock then repeat steps 1 and 2 above.