Gobby -- shared text editing over the internet/network

From the home page "Gobby is a free collaborative editor supporting multiple documents in one session and a multi-user chat. It runs on Microsoft Windows, Mac OS X, Linux and other Unix-like platforms." Home page screenshots link.

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Complete Windows TCP Client and Server code on MSDN

MSDN is huge, and it can be a pain to find what you're looking for. So when you find something, make sure you keep a reference to it.
An example found/located on MSDN:

Complete TCP Client and Server Code

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