Networking.
Connecting Internet throgh DSL Modem by using Ethernet port is the most rreliable & trusted way to get the best performance on a computer. Using DSL through USB makes system slow & doesn't provide the best of the available bandwidth. Moreover Through Ethernet DSL Modem can enable access to multiple computers by using a network switch.
"Dial up Connection"
Dial-Up
You need an Ethernet hub. Connect your modem and both computers to the hub, and both of your computers will have a connection available. The OS's only affect the connection settings on each computer.
MODEM (Modulator - Demodulator) allows communication between computers.Generally Modem connects to ISP over analog telephone line and further ISP connects to Computers over Internet.
a network connecting all computers of an organization and using the internet protocol
It depends on model. Some modems come with a wireless router. If yours has wireless interface, you will able to connect your computers wirelessly. Usually what you have is a modem with one LAN port. If you want to connect your 3 computers to the same modem you need to get a wireless router. It will allow you to connect your computers using wireless or cable. Switch in such case might not work because of internet provider policy.
Modems are a bit dated actually. Generally admins just use 'network cards' (NICs) nowadays. A network is a few computers all connected together...right. So if you want to plug your computer into that network.. where do you think the wire for the computer gets plugged into..??? The network card.
You should have your modem wired to at least one of your computers. If you have a desktop you should attach the modem to that so that it can send out the ISP to the other computers. It is necessary for you to do this, that way any other computer you use will have no problem picking up the signal and using the ISP.
By networking them through a router. Search online for information on how to do this.Additional optionsIf installing a router is not feasible, you can also network the computers together, with one serving the job of router. Also, hubs are a slightly less expensive piece of equipment (though you might need an additional IP address from your cable provider).
A null modem is a cable connecting two serial ports with the input and outputs and device control lines crossed over, so the input pin on one port is connected to the output pin on the other, and so on. It is also called a 'cross-over cable'. A null modem allows two computers to be connected together using their serial ports without using modems (hence null modem). If you used a standard ('straight') serial cable, the two inputs would be connected together, and the two outputs, and so on, so the computers would not be able to communicate. Modems have their data and control pins reversed internally, so a 'straight' cable is used between a computer and a modem.
Attach the router to the Cable MODEM provided by your ISP. Attach the computers to the router. Your ISP and router provider should have supplied cds with installation wizards to make the connections happen automagically.