You're probably looking for Send Anywhere (File Transfer), which is available (according to their description) for Android, iOS, and "PC". As the name suggests, this is not just for sharing files between devices you own, but you can share them with anyone using the app:
Hit "Send" (generates a "6-digit one time key (OTK)")
Give the key to the receiving ...
Searching for windows screen to android found a few options:
Windows Network Display Monitor Software -
spacedesk expands the Windows desktop computer screen to other computers over the local area network.
This page has a quick guide to it Use Your Android Device as a Second Monitor for Your Windows PC. Basically install on PC & android, ...
If you only wish to test the network cards are working OK I would suggest a bootable Live Linux image, pre-loaded with the network card drivers that you require. You could then have a bash or python script that runs on start-up to examine, test and list with results the network cards found. Possibly saving the results and some information on the PC tested to ...
Taking a look at my list of apps for WiFi Automatisation, it seems Smart WiFi Toggler is a good candidate for you:
turns WiFi off when not connected to a network
turns WiFi on when a known hotspot is present
constantly learns where your hotspots are located to make its decisions
Uses your network location. No GPS battery drain.
Smart WiFi Toggler (...