I have installed the Node.js on Ubuntu 12.4 and the server is running localy but how I can see the rendered page by server from other computers? Do I need to have an IP address? for this?
The command ifconfig will tell you what your IP address is. Depending on the server you're running you may need to add the port number as well. From another computer on the local network you would go to:
http://your_ip_address_here:port_number