5.1.4 Communications Media
- for writing, sending and receiving email.
Examples: Internet Mail or Outlook Express.
Email is usually text but can contain any other type of file,
sent as an attachment to the email message. An email
message is stored and can be read at any time. Web-based email
can be accessed simply by going to the appropriate website and
entering a username and password.
Video conferencing - this
allows people in different locations to see and hear each other
as if they were in the same room. It therefore requires hardware
such as microphones, speakers and a video camera. The software
controls the exchange of images and sound and the computers
normally need a good communication links such as an
ISDN line. Some software systems also allow the
users to work on files as if they were all working at one
Fax - this is short for
facsimile transmission. A fax machine scans in a
document, digitises it and then uses a telephone line to
transmit a copy to another fax machine. It is then decoded and
the copy printed out. The document is sent as an image rather
than text which makes it slower then email. The receiving fax
machine has to be switched on or the fax cannot be sent.
Bulletin boards - these
are text discussion groups. Individuals post a message to the
bulletin board and then others can read it and reply if they