Bluetooth is a personal area network (PAN) technology, which enables devices to connect and communicate wirelessly via short-range ad-hoc networks. The basic network topology(a.k.a a piconet) is a collection of slave devices operating together using one master. Bluetooth can give some secure and real time services such as data transfer, dial up-networking, object push profile and headset profile. The research aim is a chatting application to perform communication among several computers by full duplex communication in a Personal Area Networking (PAN). The programming used is visual and socket one. This programming language consists of two parts, client programming and server programming. Server must run first and client will ask a connection to the server. The range of bluetooth signal 100 meters (Class 1). The final result of this research is a client-server chatting application with one computer as a server and two others as a client. This application can work well. Every message is broadcasted by server to each client. The range of bluetooth signal is 70 meters without obstacle, 50 meters with one obstacle, and 20 meters with two obstacles. This application can also be developed for private or point-to point communicaton Keywords: Bluetooth, TCP/IP, PAN, Piconet, IP Address, Client-Server