Updates in Windows 8
Windows 8 includes the "RIO" (Registered IO) extensions for Winsock. These extensions are designed to reduce the overhead of the user to kernel mode transition for the network data path and the notification path, but use the rest of the regular Windows TCP and UDP stack (and uses existing network cards). The setup path (for example, the "connect" function) is unchanged from the regular Winsock path.
Read more about this topic: Winsock
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