xinerama over TCP/IP

Hello everyone,
   I was pretty interested to make a video-wall in an
easy & nice way & I was very pleased to know that my
old friend X already supports it through Xinerama. But
there is a problem. I need to make a video-wall of
8-16 displays, but the no. of PCI slots on a
mother-board doenst generally exceeds 4-5, which means
4-5 PCI vga cards & 4-5 displays. 
    So is Xinerama possible on TCP/IP? I mean if i can
somehow instruct Xinerama to use PCI cards on other
machines on my Network.

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