The best comparison I can make is that it’s like your entire instant messaging (IM) history with someone.

我能提供的最合适的比喻是，它就像你和某个人之间即时通讯（IM）中的完整的历史记录。

youdao

Each set of sites must be given a unique instant messaging name to be accessible by IM, and the names are then added to the user's IM buddy list as aliases.

每一组网站必须被给予一个唯一的即时通讯名称，以使即时通讯工具能够访问，随后这些名字(以别名的形式)将被添加到用户即时通讯工具的好友列表中。

youdao

IBM Lotus Sametime has long been the dominant corporate instant messaging (im) solution with its combination of security, scalability, and reliability.

IBM Lotus Sametime在安全性、可伸缩性和可靠性组合方面一直是领先的企业即时消息(im)解决方案。

youdao

It has a function on it that enables users to chat, much as they would over instant messaging (IM), but via television.

CNN: Home of future happening now

The interoperability issue among video carriers is somewhat similar in proprietary Instant Messaging systems, which also await unification among their providers so that someone on, say, Yahoo IM can talk to a Google Chat consumer.

FORBES: Worldwide Video Calling Gets Easier

Google on Wednesday released a new instant messaging and voice chat program, ending months of speculation over whether the search giant would enter the heated IM market.

FORBES