Gary,

Not too hard to do at all.  Basically you'd need an ethernet 10/100 network card in each machine, a network switch, to set up the network itself in XP (or 98), and then install Peter Dowson's FSUIPC and WideFS on the three machines.  Then it is likely for what you want you'll need WideView also to run the actual fs200X on each machine simultaneously.... about $20 USD.  The first two payware programs (together) would cost about $35 USD if I am remembering correctly.

See some of the other multimonitor threads in this and the "Hardware" forum.

best,

....................john