You can quickly switch between conversations with the menus or use the shortcut keys (F11/F12) or (Ctrl-P/Ctrl-N) or choose Select (Ctrl-S) from the Window menu to choose the conversation to switch to by name.
To select a conversation to be active from this dialog, select it with the mouse or keyboard, then press Enter or click on OK. Click Cancel to skip changing to a conversation.
For information on conversations, click here.