VNC 4.0b3 and RFB

Tristan Richardson
Wed Jul 30 17:01:01 2003

VNC 4.0b3 uses version 3.7 of the protocol, but is completely backwards
compatible with version 3.3.  I've put the latest protocol document on the
website, accessible from the documentation page

The only official versions of the RFB protocol are 3.3 and 3.7.  Various
other people have abused the RFB protocol in a number of ways but these are
not offical versions.  The latest version of the protocol document explains
better how pseudo-encodings can be used to add extensions to the protocol
without breaking compatibility.

We decided not to keep the link between protocol version number and VNC
version number since it caused confusion.



----- Original Message ----- 
From: "Mac Cody" <>
To: <>
Sent: Wednesday, July 30, 2003 3:32 PM
Subject: VNC 4.0b3 and RFB

> Greetings,
> Does VNC 4.0 Beta 3 use RFB protocol version 3.3, as did VNC 3.3.x?
> In the past, the VNC version number has appeared to be tied to the
> corresponding RFB protocol version number.  Not saying that this is
> either necessary or desired.  I just need to know what it is.  I recall
> seeing a preliminary RFB 4.0 protocol floating around on the Internet
> written by Andrew van der Stock, but I cannot find it now (I do have a
> copy at home).  If there is now an official RFB 4.0 protocol, please
> point me to the documentation for it.
> Mac Cody
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