Catching Windows desktop PrtScr

Hi,

(1) Creating Windows App in Unity, with some graphical transparent overlay on top of desktop.... (2) App will have to capture Windows screen/ or part of screen during runtime as Texture2D

(3) Any tip how to deal with it? (3.1) For Sure not: Application.CaptureScreenshot ==> this solution was capturing Unity part of App (3.2) Found some old files on stackoverfloow but nothing able to being implemeneted so far.