A close application to IM is group or multi-party messaging or the development of multi-user chat rooms.

IM的封闭式应用包括小组或多方消息传递，或开发多用户聊天室。

youdao

They are also within right to close off membership group access, remove user rights, suspend new user registration, pause forum activity, and place the forum under suspension or deletion.

他们亦有权去关闭用户组连接、移除使用者权限、暂停使用者注册、停止论坛运作或者将论坛运作终止或移除。

youdao