Hi, in older versions of the RFB patch it was possible to connect multiple VNC clients to the VNC framebuffer. With the current VNC support if I have one connected client then any other trying to connect will block until the first one disconnects.
After a quick look at vnc.c it seems that the incoming connections are handled via qemu's fd_handler function which I'm guessing is where the blocking takes place, but I'm not really familiar with qemu's code so any help would be greatly appreciated :-)
Also: Does qemu's current VNC implementation support tight encoding?
