title: VNC or NX from Mac client to Linux server
body: <p>I run an NX server and tightvncserver on my linux box (Ubuntu 10.04), with default settings.
  I have NX client and Chicken of VNC on my Mac (Snow Leopard).</p>
  
  <p>I'd like to share desktop of the linux server with my Mac client, i.e., control the existing Linux user session from Mac.</p>
  
  <p>But it seems that on my Mac both NX and VNC connections start a new session on the server.
  I'd love to know how to do a "desktop sharing" instead of standalone remote session.</p>