now you say second computer...
do you mean second screen, if so, Windows XP has oftware to automatically detect and enable a second monitor.
if it's a second computer (as in it's own CPU and whatnot) then take a look into FSUIPC. mind you that FSUIPC is payware now for advanced functions for it and other programs that use it.
http://www.schiratti.com/dowson.html
ramos
PS: welcome tim Simviation, take a look at our other help forums. including: Hardware, overclocking, aircraft wanted, etc... our screenshots, (we also host a monthly screenshot contest), and the SimV website!