ChannelListen

ChannelListen[channel] starts listening on the specified channel.

ChannelListen[channel,func] applies func to the association corresponding to each message received on the channel.

ChannelListen[channel,None] stores each message received on the channel, without applying any function.

ChannelListen[url] listens on the specified URL, storing messages received, without requiring an explicit channel to exist on the channel broker.

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