How to run applications in the background in Windows without logging in?

Question

Microsoft

Hello!
The question turned out to be a little chaotic) Let me explain.
I need to receive and process mail through The Bat in the background. But you need to do this without logging in. Those. OS booted, no one logs in, welcome screen hangs. The Bat started up in the background and starts its work. It is also necessary from time to time to access the screen with the running program.
Is this even possible?

Answer 1

google "windows run application as service"

Answer 2

And "do not log in" is important? Or will you be satisfied with auto-blocking after login?

Answer 3

Task Scheduler will help you.
The main thing is to start the program when the PC boots and on behalf of SYSTEM.