数据的一致性与容错性。由于对等计算机的信息在本地是共享的，所以就不存在数据一致性问题。但是由于没有固定服务器的支持，所以每一个对等计算机都要独立保存一份-Purpose of this paper is to use Visual C++ language to design a non-fixed pure server P2P communication model. So that between users will be able to rely on software to communicate with the agreement. In this paper, the design of this model, and the realization of the principle expounded in detail, and on this basis to achieve the functions of a brief introduction