| channelName | The name of the channel to retrieve. |
| handler | The channel handler to register. |
Action This action can be invoked to unregister the handler from the channel (see ChannelService.UnregisterMessageHandler).
Gets or creates a new channel.
When you create a channel, the ChannelService listens to connections on it, and routes all messages sent to it. You have to register a handler to process the messages and send them back to other clients."
If a channel with the same name already exists, it appends the handler to its list of handlers. This allows you to log or listen to all messages sent to a specific channel.