In Beta and feature complete! Code cleanup to follow.
Desktop application based on Node-Webkit, Node.js, and Socket.io for sending and receiving pings (brief messages).
Client:
Download node-webkit from https://github.com/rogerwang/node-webkit
Run client or admin per instructions for your platform here: https://github.com/rogerwang/node-webkit/wiki/How-to-run-apps
Server:
Download and install node.js from http://nodejs.org/
In the server directory run "npm install".
Edit the IP addresses in server.js to the IP address of your computer.
Start the server with "nodejs server.js".