I need to develop an instant messenger (e.g. MSN Messagner, but only a simple and basic function is in order) based on .Net (C #). I want to integrate the messenger with my current website user. I want to know what kind of exchange an instant open source exchanger (better C #) for the link?
BTW: some users use the internal IP address (behind the gateway or proxy, for example 10.10.xxx.xxx) - so in this case two users cannot use point-to-point messaging if they both are behind the gateway? And I think that I need to develop a server that acts as an intermediary for sending a message between two users, right?
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