Changing the welcome Screen

Hi
I wonder weather I can change welcome screen depending on user is already registered or not.

My step are follows

1. At the First time user open the app he will be at the registration page.
2. Second time he opens the screen user will be at the sign in page.

I need the exact scenario to happen in my app?

Could that be done?
Please suggest me a method to do so?

Thanks
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