Creating a listener on a client (synchronous chat)

[hankthetank]

Hi,

 

I want to create an ASP.Net web application (like a synchronous chat program) that listens on a client for incoming data and then updates the client window when that data arrives.

 

Only problem is I have no idea how to do this sort of thing and was hoping someone might be able to point me to a useful site or post that could get me started??

 

Thanks in advance!!