In particular this model demonstrates how integer values can be packed and unpacked at bit level using the PackUnsignedInteger and UnpackUnsignedInteger blocks.
This example sends data to address 127.0.0.1, which is a special-purpose IPv4 address and is called the localhost or loopback address. When you have to transfer data to another computer you have to use in uDPSend that computer's IP. You've also to set the port number of the remote computer you want to send to.
When you want to receive data from another computer, you have set in uDPReceive the actual port number of the local computer you a willing to receive data to.