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Block and unblock messages
To block messages, connect to the instant messaging service and select 
Conversations > IM contacts, or join or start a conversation. Scroll to the contact 
from whom you want to block incoming messages, and select Options > Block 
contact > OK.
To unblock the messages, connect to the instant messages service and select 
Blocked list. Scroll to the contact from whom you want to unblock messages, and 
select Unblock.
Groups
You can create your own private groups for an instant messaging conversation, or 
use the public groups provided by the service provider. The private groups exist 
only during an instant messaging conversation. The groups are saved on the server 
of the service provider. If the server you are logged on to does not support group 
services, all group-related menus are dimmed.
Public groups
Groups — You can bookmark public groups that your service provider may 
maintain. Connect to the instant messaging service, and select Public groups. 
Scroll to a group with which you want to chat, and select Join. If you are not in 
the group, enter your screen name as your nickname for the group. To delete a 
group from your group list, select Options > Delete group. 
To search for a group, select Groups > Public groups > Search groups. You can 
search for a group by a member in the group, by group name, topic, or ID.