Answers:
why would you want to, standard wireless see cards operate much faster than bluetooth.
no-one is going to design something inferior to an existing solution
Yes but the reading will suck - if you must be wireless afterwards use wireless or homeplug
Bluetooth can be really unstable, but I hold see it work between two computers.
Wi-fi is faster and more reliable and not necessarily expensive. Two usb/wi-fi adapters should set you wager on give or take a few lb40.
Yes, computers can be network using Bluetooth. For this you involve Bluetooth adapter for respectively individual PC. Networking computers using bluetooth is a costly and unreliable method. Instead use Wireless router to web your computers if you want to use Wireless technology. D-Link, Netlinx,... are providing adaptable routers for home and small department network.