How to disable Android notification bar?

Hello!
At first, sorry if it’s topic that exists somewhere else. I used search engine and it didn’t give me satisfactory result.
My question:
Is it possible to disable Android notification bar? I don’t mean disabling it when notification come, but when user expand it manually by touch at the top of the screen and slide down.
I tested this “feature” in many games and each of them allows to expand notification bar with touch. I am little surprised.
Thanks!

As far as I know,
it’s System Level,
you can do just hide it but you can’t effect user’s expectation.