客户端可通过如下方式加入多播组。

The client can join the multicast group in the following way.

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groupName：多播组数目。

GroupName: The multicast group number.

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希望加入这个多播组的对等计算机必须显式地预订这个组。

Peer computers interested in being a part of this multicast group must explicitly subscribe to the group.

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