 When the value is
 <code>application</code>, then all channels with the same name throughout the application will receive the same push
 message. When the value is <code>session</code>, then only the channels with the same name in the current user
 session will receive the same push message. When the value is <code>view</code>, then only the channel in the current
 view will receive the push message. The default scope is <code>application</code>. When the <code>user</code>
 attribute is specified, then the