----- Original Message -----
From: jordi navas <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: 17 January 2001 23:11
Subject: VNC adapted for classrooms
> We are working on a first version of a product based on VNC that is
adapted for classroms.
> It will take some features like a Multicast protocol.
> I'm sorry to say that for now, it will be a spanish-windows-only version.
>
> Is there anybody working on something similar??
> Anybody working/talking about multicast for VNC?
I considered a multicast extension to the protocol a long time ago. One
problem you will have to overcome is that unless the client knows how many
bits per pixel the server is using it will not be able to decode the buffer
update messages from the server (it's a shame as there's an unused octet on
the message header which could have been used to hold the information which
would fix this and another very obscure problem with the point to point
protocol).
As you multicast uses datagrams |I think that you will also need to address
the issue of buffer updates which are too large to fit in a single packet
(you *really* don't want to send fragmented packets if you can help it).
It's a rather interesting programming challenge to turn a single buffer
update massage into n messages each smaller than m bytes ;)
John Wilson
The Wilson Partnership
5 Market Hill, Whitchurch, Aylesbury, Bucks HP22 4JB, UK
+44 1296 641072, +44 7976 611010(mobile), +44 1296 641874(fax)
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