quote:
Originally posted by markee
(...) I also need to find out how to close a chat window using the WLM API so it can be done quicker and more efficiently
Already done, shown and explaned...
Simply send the window message WM_CLOSE to the chat window.
eg:
Plik's reply to is this possible.
etc... (search for WM_CLOSE)
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As for how the messages are sent, how the server knows you are offline or not, how the verification of sent message work, etc... I'd suggest to read:
http://www.hypothetic.org/docs/msn/index.php (site is not updated in a long time so it doesn't contain all the ins and outs of the new protocol versions, though it will give you the most detailed explanation there is to find)
http://msnpiki.msnfanatic.com/ (has some (more up to date) info too but not quite as much as on hypothetic.org).
(instead of guessing 
<= EDIT: and this was said in general; at no-one specific )
/ 
I've read a lot of that and also done some bot work