DirectPlay

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DirectPlay is part of Microsoft's DirectX. It is a network communication library intended for computer game development, although it can be used for other purposes. DirectPlay is a high-level software interface between applications and communication services that allows games to be connected over the Internet, a modem link, or a network. It features a set of tools that allow players to find game sessions and sites to manage the flow of information between hosts and players. It provides a way for applications to communicate with each other, regardless of the underlying online service or protocol. It also resolves many connectivity issues, such as Network Address Translation (NAT). Like the rest of DirectX, DirectPlay runs in COM and is accessed through component object model (COM) interfaces. By default, DirectPlay uses multi-threaded programming techniques and requires careful thought to avoid the usual threading issues. Since DirectX 9, this issue can be alleviated at the expense of efficiency. DirectPlay is built on the User Datagram Protocol (UDP) to allow it speedy communication with other DirectPlay applications.