Help needed to develop MESSENGER

Hi,
I would like to develope an Instant Messenger with Flash 8.
I have linux installed on my SERVER with php, mysql and
amfphp and all are working fine.
I have also designed the database required, but I do have a
problem. Can anybody tell me the concept of messenger chating
window....?? I mean to say how it is possible to send messages to
the end user who is online in my list....?? What should I do to
detect the window opened at his end and populate that msg. window
with my message...??
If anybody can help me out to understand the concept. Whether
I should use the client's login session ID or the opened window to
send the message or what...??
Help for this topic will be highly appreciated.
Thanks and regards,
Shrijal.

There are 2 ways to do a chat: have the server transmit the
messages to the users or let the client ask the server for new
messages. I'd recommend the first one, it's faster and also easier.
For that, you'll need a socket connection clientside
(XMLSocket) and a server process serverside. Now this is where the
trouble begins, most web hosters don't allow you to start services
on their servers. But as you mentioned you have your own server,
this shouldn't be a problem. Pick a language of your choice or
maybe use php to write the server, and let it manage the open
connections, so when a new messages arrives, it can broadcast it to
all other connections.
If you won't or can't do it this way, your clients have to
pull for the messages, meaning they have to ask the server in some
interval for new messages, and load them if available. You can't
actively send the messages to some user, they all have to get them
by themselves. There's a tutorial on that way here:
http://www.sephiroth.it/tutorials/flashPHP/flash_chat/.
cheers,
blemmo

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