Unreal3.2 Docs wrote:
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Makes it so you can not receive channel PRIVMSGs (with the exception of text prefixed with certain characters, see set::channel-command-prefix)
This mode is primarily set up for bots that you want to log stuff. They can activate this user mode and have all commands assigned with !. Then they can see the commands and the text following the command but not all other text that is being sent to the channel.