A web3 relay, to be able to use Ethereum DApps with web3.js from any browser.
You need to install first node.js package on your system.
cd server
npm install(you should see a new node_modules folder inside 'server').
Ensure you are running a local Ethereum node, with JSON-RPC service listening at the default port.
node web3_relay_server.js(the server should start listening at 5000 http port).