Underscore (_)
Space ()
At sign (@)
Period (-)
E-mail
Instanotes
Instant messaging
Chat
specially development for the web
are versions of SGML
are based on SGML
independent of SGML
*
@
!
^
Input data
Output data
Data processing
Central Processing
Created using HTML
With links to other web pages
Residing in many computers linked together using HTML
Residing in many computers
the horizontal naming system
the distributed hierarchical naming system
the vertical naming system
the client server system
Form : and Subject
Form: and To
From: and Date
From: and Body
Doc file
machine language
http
HTML
Weblog
Message board
Webmail interface
Forum
