You can use free programs like Team viewer.
NO!!
According to Australian Bureau of Statistics' recent findings (2006-2007), 64% of Australianhomes had Internet access and about 73% of the residents had access to a home PC.
Yes, you can.
GoToMyPC login is a webpage that allows you to access anything on your home personal PC through the internet on any other computer in the world. This allows you to work anywhere you need.
One pc, internet connection
Yes that technique is often employed. (I do so at home accessing my basement computer which has a faster connection from my upstairs connection).
VPN client
yes you do or it will say eorr all the time you try (not true) You don't have to have a PC for the slim PS3 to get on the internet, but you do need internet access. Most people do not have internet access unless they have a PC already. Some people live close enough to free wireless access than they can log into the wireless connection that is near them. You may even have a neighbor who has wireless and will let you use there access. In any case you can purchase internet access without purchasing a PC if you choose to do so.
Yes, unless the owner of the PC blocks access, any users who are allowed to use a PC connected to the internet can share that internet connection.
use reverse tethering software for root user.
can i use an external bluetooth transmitter to gain internet access for my pc from my cell phone service?
Answering this purely from a network perspective, to interface with the Internet, a PC needs: a router (access-point, switch, router, NAT device, DNS server in one), a subscription to an ISP (Internet Service Provider), cabling, an Internet-ready home, and a NIC (Network Interface Card). The BASIC essentials needed to access the Internet.