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the iptable isnt that complicated
its only one line !
should look like :
iptables -A INPUT source  mask dest mask  -tcp -port portnumber
and delete is exacly the same execpt -D instead of -A

why go to all the trouble of setting many boxes 
X supports multi screen right out of the box
now if it is supported (i mean by that that the interface differenciate independent screens )
thats another story ...

Kubutu and other window manager are all capable of handling multi-screens
(many right out the box)