该文详细比较了Linux, Android和OMS的区别，是一部比较详细介绍这几个概念的入门级指导ppt。-In this paper, a detailed comparison of Linux, Android and the difference between OMS, is a more detailed concept of these entry-level guide ppt.

基于云计算的OMS即时通讯服务器端编码 -OMS cloud-based instant messaging server-side encoding OMS cloud-based instant messaging server-side code