https://forums.macrumors.com/threads/what-is-windowserver.59082/WindowServer draws everything you see on the screen. It acts as a mediator between applications that want to draw on the screen and the graphics hardware. When an application wants to draw something, it establishes a connection with WindowServer, tells WindowServer what to draw, and WindowServer handles the drawing / compositing / Quartz Extreme hardware acceleration to finally produce what's seen on the entire screen.
Simulated Input Ignored
WindowServer has simulated mouse or keyboard input that Little Snitch has ignored for security reasons. You can allow simulated input in Security preferences by enabling “Allow GUI Scripting access to Little Snitch”.
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