framebuffer refresh

[Nano Ip]

Hi

I am working with VNC server in Debian Etch.

I would like to explicitly refresh server's framebuffer. I tried "xrefresh" 
command but
I understood that VNC server works with client's update requests. There is a 
separate
protocol for updates.

Is there a small software what does:
vncrefresh -display :3
and VNC server updates all the windows and desktop.

Or is the only possibility to program a software which connects to the
VNC server and sends the framebuffer update message and exits?

Best Regards
Indrek

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