trying to make a customizable lock screen WPF app

[Hazem_3]

Hello I want to make a customizable lock screen app. Im trying to make it such that you can access your computer in different ways (like using the accelerometer). I've already managed to use the accelerometer in the WPF app (through a method that allows me to use winRT APIs). But the problem is, I don't know how to make it such that (with administrative access) I can essentially freeze access to other apps and files (like the windows lock screen). I read somewhere that you can use some APIs from another framework other than .NET . Could you explain how this can be done?