  You can invite others to join an instant messaging session in progress, just as you would when starting an instant message.
If the instant message has "Enable catch up" cleared in the Setup section, newly invited users won't see earlier input in their view of the transcript. You can allow them to see the transcript from the beginning of the session if:
• you are the instant message creator (private instant messages)
or
• you have moderator permission (chat rooms).
To display earlier input, select "Enable catch up".
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