This patch adds the option -master to the VNC server. With this option enabled the first connection to the server requires authentication while subsequent connections don't require any authentication but are presented in view-only mode. This is useful when using VNC for didactics because you don't want your students to know you VNC password and don't want them to modify your desktop. This patch is written against the source of the package vnc-3.3.7 of the Gentoo Distribution. manu-patch 10.10.2003 paolini@math.unifi.it