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Nathan, this is pretty nice, how many users do you envsion using this at
the same time. I typed test in each window where it came back to all 4
windows and I did it from each different color, that way it showed me that
no matter where you typed all users could see it based on where I typed it
from.

On Thu, Jan 12, 2012 at 2:23 PM, Nathan Andelin <nandelin@xxxxxxxxx> wrote:

One premise of virtual meetings is that all participants receive
broadcasts simultaneously. The nature and format of broadcast content may
vary from one type of application to the next. The types of messages for
slide presentations would be different from those of white boards, or
chats. But they might share a common architecture for delivery.

The whole idea of broadcasting may seem counter intuitive to some Web
developers. We normally think in terms of one-to-one pairing between a
browser request and a server response over a single socket. A browser makes
a request and gets a response; the cycle is complete.

The typical way to simulate broadcast services using browsers is to set up
a continuous loop using a timer and JavaScript to fire off requests at say
1 to 5 second intervals for "new" content. However, that's inefficient and
doesn't provide for participants getting simultaneous responses. A response
may show up in 1 second for one participant, or 10 seconds for another,
which is annoying. It also requires that posted content from one
participant be stored persistently so it might be retrieved soon thereafter
by others. I recently reviewed about 15 chat servers, mostly PHP, which
followed that design. It's really common.

Some of us may have read about "Comet" implementations that allegedly work
better.

I've been working on a new client-server architecture that takes a
somewhat different approach, which is both efficient and provides for
essentially simultaneous delivery of broadcast content. I've delineated the
architecture along with an application that demonstrates a meeting of 4
chat participants, though I could see it scaling to thousands, even on a
small IBM i server.

http://bit.ly/yVUUuQ


I'd appreciate feedback, or questions.

-Nathan

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