afaik, after LS send usertoword to the worldserver, nothing more happens between LS and world.
It only is a premliminary to client contacting the world, with the id and key that were sent in LS -> world usertoworld request
Basically :
1. client contacts LS, to auth
2. LS replies and tells client it's accountid 1234 and private key AbCdE
3. client tells the LS it wants to connect to world N
4. LS tells world N that it will be entered by client, id 1234, key AbCdE
5. client contacts world presenting id 1234 and key AbCdE
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