it seems to pop up the persons ip address before they even initiate a file transfer with you (that you see visually) .. 
i've gotten a popup a few times, where i killed the connection with an individual & then... later on, when i was doing nothing... a direct connection had been detected with them for some apparent reason, their dp was not updated... so i don't think my messenger grabbed their dp (i know i can get a popup if i view an individuals contact card and their dp has been updated) 
any more info on what triggers a direct connection happens & when? 

 this is like 'open window notifier' 

 haha
* seems even if i close messenger & open it & sign back in... a min or less after that this 1, individual keeps poping back up in the detected (new) list 
 
also a suggestion: in the ip connections gui, could you add in the usernames, or email address's that the ip's come from somehow?