A modem uses the phone line to connect to the internet. This is usually slower than a wifi connection.
You need at minimum, a telephone line.
The modem on your computer must connect to your Internet Service Provider's server over a land telephone line. You connect the computer's modem to a telephone jack as you would a telephone.
Dial up uses a telephone line to connect to the internet and is much slower than cable.
You don't. The laptop has to connect to the internet separately, either directly through a telephone line (for dial-up service) or a broadband DSL/satellite/cable modem. If you want to connect both machines at the same time, you need a router between the modem and the two machines. (NOTE: this cannot be done with a single telephone line, only with broadband)
Through the Telephone Line.
No it needs an ethernet cable connection to an internet service
A telephone to connect to and a game for the internet.
A modulator demodulator (MODEM)
Telephone line. Either unplug telephone and connect lead to computer while online, or get double-socket ADSL connector so telephone is unaffected.
The connection allowing a computer to connect to the internet and "surf the web" is typically ethernet. Older computers, however, may rely on a telephone modem and subsequent telephone line.
In some countries there are Security Businesses that will design, install, and maintain / monitor CCTV systems