EzComm COM DLL
EzComm.NET COM DLL (Note: the only difference is the Events interface is optimized for .NET)

The EzComm COM DLL makes it easy to connect two computers and begin sending messages or files between them. The messages can be anything - text or binary data, and the computers can be on the same network or across the Internet anywhere in the world. Use EzComm in your VB, C++, .NET or Delphi programs for any applications that need to send messages or any kind of data, such as eCommerce applications exchanging XML documents or Instant Messaging and Chat programs.

What is EzComm and how does it work?

EzComm is a set of COM objects that take care of all of the low-level TCP/IP work for you, making it easy to begin exchanging messages immediately. If you've ever tried writing your own sockets program, you know how much work is involved in defining and implementing a messaging system. That's what EzComm does for you, providing a turn-key messaging solution.

EzComm can be run on any number of machines - but there is only ever one connection between a single client and server EzComm instance.  You may be want to connect several PC together.  You can do this using multiple instances of EzComm.  Probably the easiest way to accomplish this is for one PC to act as "server" for all clients, and for it to foward all messages it receives from connected clients. You would write your application code to use and manage all of the EzComm objects.  Each time a new client connects to the server, it is added to a list of connections the server maintains.  For example, suppose you have PCs A, B and C, and PC A is acting as server.  You write your server code such that it listens for incoming connections.  When PC B connects, it stores this connection object in a list, and loops around and waits for another connection.  When PC C connects, it does the same.  When PC B sends a message to the server, you could write code to forward the message to all connected PCs in the list.  This is only one scenario.  You can probably think of others, such as a peer messaging system.