AcraL
И TCP, и UDP под Windows работают через API WinSock.
Цитата:
The Windows Sockets API is a standard API under Windows 2000 for applications that use TCP and UDP. Applications written to the Windows Sockets API run on many versions of TCP/IP. TCP/IP utilities and the SNMP service are examples of applications written to the Windows Sockets interface.
Windows Sockets provides services that allow applications to bind to a particular port and IP address on a host, initiate and accept a connection, send and receive data, and close a connection. There are two types of sockets:
1. A stream socket provides a two-way, reliable, sequenced, and unduplicated flow of data using TCP.
2. A datagram socket provides the bi-directional flow of data using UDP.
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http://technet2.microsoft.com/Window....mspx?mfr=true
http://www.microsoft.com/technet/pro....mspx?mfr=true
http://technet.microsoft.com/en-us/l.../bb758873.aspx
В общем, инфы на M$ Technet - полно, но на её поиск нужно достаточно много времени...
http://search.technet.microsoft.com/...0winsock%20API