If you can ping it by DNS name (who uses plain old IP adddress - it is so inflexible) and telnet into TCP port 1433 and UDP port 1434 you should have no problems. If things are firewalled between networks then there are a number of ports that need to be opened as well.
RegardsRudy KomacsarSenior Database Administrator"Ave Caesar! - Morituri te salutamus."