You can list every steam account (user id in all formats) that was used to sign in the steam app on windows. It can also detect active steam account that is currently running steam app. Data is based on steam registry keys. Open any user profile in steam app. Get users current diplay names.
Create BlurEffect object and call ApplyAsync method, you shall pass the Bitmap object that will be modified, also you shall pass the blur radius in pixels. As the blur radius increases, the bluriness is increased as well.