So, you need to simply share something with someone on the same network without going through facebook or anyother chat application.
Use a simple HTTP server! The examples below are meant for Linux users, I'm sure you can use them on Windows aswell.
For python you can use
python -m SimpleHTTPServer 8000
If you have PHP installed
php -S localhost:8000
A node.js server
sudo npm install http-server -g
For TCL you can use tanzer, tclhttp but I haven't been able to find a oneliner so I'll exclude this untill later.