OSG快速入门指导。适合于OSG初学者使用，文中对OSGText,OSG Render,OSG Node，OSG Group都有基础的介绍。很容易上手。

A token ring network consists of a set of nodes connected in a ring. The ring is a single shared medium. The token ring technology involves a distributed algorithm that controls when each node is allowed to transmit. All nodes see all frames, and