What you are asking is if there is a way to define a static route from one workstation to the other without using default routing tables, or DNS, etc.. that may cause excessive network hops, correct?

Answer: I do not know how you would go about doing this:

How are you wanting to connect to your friend?
What download speeds are you currently getting from your friend? (100+kbps is excellent over 10BT).
Have you tried other methods? (FTP, HTTP, Telnet, AIM, etc...)
Do you know the administrator of the network real well?

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Death is lighter than a feather - duty heavier than a mountian.