A very first example of peers interacting in a netwrok for sharing their own phonebook's contacts
In three separate terminal windows or tabs launch the three peers examples provied (Satoshi,Vitalik,Killer) by typing respectively
# Terminal window 1
bash run-satoshi.sh
# Terminal window 2
bash run-vitalik.sh
# Terminal window 3
bash run-killer.sh
Then play with the menu for looking-up for phone contacts on each client and read carefully the message on their console for understanding the mechanism
Have fun :-)