Have you ever needed to install an OS and get a big download to get its updates Simon so that when you deliver it to whoever you have done it for as they only have 56K and it would take then forever to download SP1 for example for XP ?
As you are set up now you would connect to your Fujitsu and sit there twiddling your thumbs while you wait for it to download onto that PC.
If you are networked while its doing that you can carry on doing what you want on your own PC while you wait.
You an even be looking for drivers for the other pc on yours and then download and transfer them to the repaired\new build pc while its installing the OS etc.
By the way a new proof that Sods Law is in existence
Just after I started extolling the virtues of a router\modem,my connection dropped,first time for ages
It was down for about 10 minutes but as I had a router\modem I just went to the router PPP page and waited untill it showed that it had re established a connection and I knew I was back on line again.
In the meantime I could go and make a cup of tea and some toast and just check back to see if it was back on line.
No more of that clicking the connection every few minutes to see if it would connect and waiting for it to dial up