The newest laptop I have runs Win7.
My TV has WiFi capabilities (it's only about four-years-old). Typically I copy computer files (movies in MP4, MKV, etc...) to a thumb drive, plug it into my BluRay, and go through that into the HDMI on my TV.
Sometimes files have an odd format and don't play, so I was thinking of A: being able to play on the laptop and view on the TV, B: be able to access the files directly without going through a thumb drive, C: being able to connect things like security cameras to the laptop instead of going through Internet WiFi, D: being able to view files on the laptop from other laptops via WiFi.
I thought Miracast is more about streaming video whereas I want something that acts as a WiFi mainframe (I'm uncertain what to call it) where it acts as a central hub.