In this article, we discuss two ways to work with groups.
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此选项可防止在开始处理组中的消息时却发现后续消息尚未发送或尚未到达的情况。
This option prevents us from starting to process messages in a group only to discover that subsequent messages haven't been sent yet, let alone arrived.
The GroupManager script library includes functionality to deal with hierarchies of groups (groups that contain other groups as members), down to six levels of nesting.