ICQ 6.5 includes the
Grouped Conversations feature which enables grouping conversations into one Message window. Each conversation appears in a different tab. You can switch between conversations by clicking the tabs.
Note: You can use the
Options menu >
Customization >
Messages & Files to set ICQ to
Show conversations in different windows.
You can separate conversations and open a new window for a specific conversation by clicking the
Separate this conversation button when in this conversation tab.

Click the
Return conversation to main panel button to return the conversation to the group.