10m is not such a long way away for VGA, we've got away with running VGA over unscreened CAT5 up to 25m at work, although im not recommending this.
As far as splitting is concerned you will need a graphics card with two outputs, and windows will be able to display on both screens.
Most newer graphics cards have DVI and VGA outputs, you can get a DVI - VGA converter so you have two VGA's then make a CAT5 leads with 2 D-SUB ends
Thanks for that the 10m bit is what I wanted to hear. Just ordered new PC looked a spec online and it has an ATI Radeon X1700SE, says it has
1 x display / video - VGA - 15 pin HD D-Sub (HD-15)
1 x display / video - S-video output
1 x display / video - DVI-Analog/Digital - 29 pin combined DVI
The way they do it at work is with KVM switches, usually the keyboard and monitor/mouse are a good 30 to 40ft away from the PC main unit
Not worried about keyboard or mouse. Looking for minimalist in living room so no DVD player, HDD recorder etc just TV on wall.
So PC will be DVD player and BBC iplayer and CH4 on demand for must see programs. Also computer will have TV card for recording if need be.