To use Wireless communication on the Lithne you need two libraries, one for LithneDuino (is included from LithneDuino v0.3) and one for Processing.The communication library allows for wireless communication between different Lithne nodes by using the XBee protocol.
Three examples are included which allow for sending data from one node to the other, println to a remote computer with XBee Explorer (in combination with Processing) and measuring signal strength. If you need more detailed information; all fuctions are documented in the API docs for Arduino and the API docs for Processing.
Adjust the sketches to your needs, paying special attention to the XBee addresses, and upload them to the Lithne.
The Lithne library for LithneDuino and Processing are hosted on GitHub. In case you want to clone these libraries to your local drive, you can use the following addresses: