When a client is not attached to your LogMeIn Hamachi account it will be labeled as [Guest] on the Networks > My Networks page of the LogMeIn.com website.

You can remove a [Guest] client from a network, but you cannot change the client's settings. If you remove a [Guest] client from all your networks it will not be displayed in the Networks > My Networks page as your LogMeIn Hamachi client. To remove the [Guest] label from a client, you must attach the client to your LogMeIn Hamachi account. For information, read the following article: Attach an unattached client to a LogMeIn Hamachi account.