When i re-read it, it seems full of jargons.

Download the following freewares.
Discover all the NDI tools and plugins you need to set up, test, and manage your NDI streams. For Windows and macOS.
www.ndi.tv
Control multiple windows systems with one keyboard/mouse. Share a keyboard and mouse across multiple windows system.
www.inputdirector.com
You will need a network Switch.
You will need to create a new task for ndi screen capture in task scheduler which will need to start everytime the pc starts...Follow the link
Task Scheduler can automate tasks on Windows 10, and in this guide, I'll show you how.
www.windowscentral.com
NDI screen capture is way to see the connected pcs windows without using capture cards.
I use it regularly for my online shows.