What is HTML (Hypertext Markup Language)? Telnet? Usenet News?

HTML (Hypertext Markup Language)

It is a computer language to prepare Web pages. Hypertext is a text with extra features like formatting, images, multimedia and links to other documents. Markup is the process of adding extra symbols to ordinary text. Each symbol which isused in HTML has its own syntax, slang and rules. It is not a programming language. It is markup language. It classifies the parts of a document according to their function . in other words it indicates which part is title, which part is a subheading, which part is the name of the author, and so on.

Telnet

Telnet  service  enables  an Internet  user to log in to another  computer  on the Internet  from  his/her  local computer. That  is, a user  can  execute  the  telnet  command   on  his/her  local  computer  to  start  a login  session  on  a remote computer.  This action  is also called  “remote  login.” To start a remote  login  session,  a user types  the command  telnet  and address  of the remote  computer  on his/her local  computer  terminal.  The  system  then  asks the user to enter  a login  name (user  ID) and a password.  That  is; the remote  computer  authenticates   the user to ensure  that  he/she  is authorized  to access  it. If the user  specifies  a correct  login name  and password,  he/she  is logged  on to the remote  computer.  Once  login  session  is established with the remote  computer,  telnet  enters  input mode,  and anything  typed  on the terminal  of the local computer  by the user is sent to the remote computer  for processing.

Some common  uses of telnet   service  are:

1. Using  computing   power   of  remote   computer.   The  local  computer   may  be  an  ordinary   personal computer  and the remote  computer  may be a powerful  super computer.
2. Using a software  on remote  computer.   A software  that  a user wants  to  use may not  be available  on his/her computer.
3. Accessing remote  computer’s   database  or archive.  An information  archive  of interest  to a user   such as public database  or library resources  may be available  on the remote computer.                            ‘
4. For logging  in to  ones  own  computer   from  another  computer.   For  example,   if a user  is attending  a conference   in another  city  and  has access  to  a computer  on the  Internet,  he/she  can telnet  to his/her own computer  and read his/her  electronic  mails or access  some information  stored there.

Usenet News

Usenet service enables  a group of’Internet   users to exchange  their views/ideas/information    on some common  topic of  interest  with all  members   belonging   to  the  group.  Several  such  groups  exist  on the  Internet  and  are  called news groups .  For  example,  a newsgroup   named  comp.security.mise    consists  of users  having  interest  in computer securiy issues.                                                                                                                                        .

A newsgroup   is like a large notice  board accessible  to all members  belonging  to the group. A member,  who wants to  exchange  his/her  views/ideas/information     with  other   members,   creates   a  specially   formatted   message   and submits it to the usenet  software  running  on his/her  own computer.  The software  posts the message  on the virtual notice  board.  The  post~d  message   can  b.e read  (seen)   from  any  member’s    computer   belonging   to  the  same newsgroup,  Just as a notice posted  on a notice  board can be read by anyone having access  to the notice  board.