The meaning of the prefixes is the same (negation the adverb), but they are still different prefixes. im与传统的实时聊天不同之处： 1、IM即时通讯具有实时性和即时性：消息几乎是即时传递，用户几秒内就能收到对方的回应。 这是小方特地给 C/C++ 开发的同学精心准备了一份优质学习资料———— CppGuide，内容从 C/C++ 语言、网络编程、操作系统原理到完整的项目源码分析，同时这份资料也包括 C/C++ 学习方法、推荐的阅读书籍、简历指导和求职技巧等。
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The expression i'm in or count me in mean that you wish to be included in a proposed activity
I'm going to the bar
Anyone else coming? count me in! i believe the expression may originate from gambling, possibly poker, or some other card game where players are dealt a hand and then decide whether they are playing on by saying that they are either in or out 容联云通讯是国内第一家IM PaaS云服务提供商，专有云是容联云通讯倾力打造的企业级即时通讯云服务。 开发者通过客户端SDK和云端开放API即可在最短时间内获得稳定可靠的IM功能。 PaaS服务模式，全面支持Android、iOS、Web、PC多平台。 它的跨平台特性也使得用户可以在不同的设备上保持通讯的连贯性。 3、野火IM（WildfireIM） 野火IM是一个活跃的开源项目，其GitHub上的star数达到了3.5k，在国内开源IM中排名第二。 野火IM的客户端和服务端都是开源的，这意味着开发者可以根据自己的需求进行定制。 The phrase who's in? does exist in very informal english, at least in american english
It is equivalent to saying who wants to participate in x with me? it is not used very often, at least in my experience However, people will understand what it means if you say it in conversation For example, if you wanted to get food I'm feeling hungry, so i'm going to order pizza
