Welcome to &TCPIUG;. This book describes you can use the telephone network to create a collaborative network using computers. To implement the configuration described in this book, you need two or more computers connected to the telephone network of your country by mean of modem devices. Optionally, you could use Ethernet devices (e.g., switches) to create local area networks (LANs) on both ends of each connection established over the telephone network for sharing information between them. For example, consider an infrastructure where you have one LAN for each province in your country and then, each of these LANs is connected one another to share information between them using the country's telephone network. This infrastructure would be as expensive as a national telephone call would be (without counting the consume of electrical power required by computers, of course). To make the information of this book managable, it has been organized in the following parts: describes how to configure server and client computers to transfer IP packages through the telephone network. This is the first step you need to setup in order to use the internet services described in . describes how to configure server and client computers to exchange information using internet services over the telephone network. Once you complete this step, your collaborative network should be ready for production. describes the lincense documents mentioned in this book. &preface-overview; &preface-docconvs; &preface-feedback;