Connect a Network of Computers to the Internet?

Multiple computers can share a single connection to the Internet.  This works equally well whether the connection is an ordinary telephone line, and ISDN connection, an ADSL/Broadband link, or a Lease Line - but, naturally, the faster the connection the greater the number of computers that can be connected effectively without slowing to an unworkable speed.
. Costs of connecting multiple computers will vary depending on the numbers and location of the computers, and the specification of any existing computer network.