"Visual Basic 5 Client/Server How to " The project in Infocus Tech in Ampang, Kuala Lumpur with Lucent Definity PABX which utilize the sample project in the book for the Call Centre Application. I have this book with me , Mr. Chan Junt Hoong since I joined Infocus Tech in 1998 have been in my technolgy book collection since then. I programmed the then IVR (Interactive Voice Response System) which utilize the Natural Microsystems Application Board and the Industrial Computer IPC Server.