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- 19:To enable computers to
- 30:talk to one another,
- 41:across the internet
- 53:they need to be
- 61:connected together and
- 80:this connection is
- 93:usually done by
- 101:telephone lines.
- 115:So theoretically, if
- 125:you've got a telephone
- 135:line, then you too can
- 151:connect to the internet.
- 170:
- 180:Of course it's not
- 187:quite that straight
- 193:forward because you
- 205:can't just plug your PC
- 221:into the telephone line -
- 236:your PC needs a special
- 250:box, called a modem, to
- 268:make that connection.
- 280:
- 291:Now there are two basic
- 301:types of modem,internal
- 319:ones, which fit inside
- 335:your PC, and external
- 356:ones, which connect to
- 371:it from the outside.
- 380:
- 393:Let's just have a quick
- 400:look at what we're
- 406:talking about.
- 425:This is an example
- 438:of an internal modem,
- 457:which, as I said earlier,
- 471:fits inside your PC.
- 500:And an external one,
- 522:much easier to spot
- 532:if you've got one of
- 539:these, because you've
- 550:probably got a black
- 562:box, like this, lying
- 579:on your desk, next to
- 591:your PC.
- 605:
- 619:The modem creates the
- 632:link between your
- 643:computer and the
- 655:telephone system.
- 676:But some people are
- 686:not absolutely certain
- 703:whether they have an
- 715:internal modem or not.
- 730:
- 745:Don't worry about it,
- 757:we're going to check
- 765:your PC now, to see
- 783:whether you have already
- 795:got one installed.
- 810:
- 820:
- 830:
- 840: