The World Wide Web (WWW) was originally developed at the CERN in Switzerland as a way to give common interface to the existing communication protocols in the Internet and all the different ways of data exchange formats. The WWW is one of the most efficient mechanisms of information exchange through the Internet because its multimedia configuration.
The WWW uses a protocol called http (HyperText Transfer Protocol), that allows the transfer of coded representations in MIME (Multipurpose Internet Mail Extensions) between client-server. The WWW is increasingly becoming a service of information exchange based on the use of a hypertext language known as HTML (HyperText Markup Language), which is a subset of Standard Generalised Markup Language (SGML). In a document made in HTML, words can be connected to other documents by means of quotations that redirect you to other pages where some other information is displayed. The WWW is configured in an architecture client-server where the client connects to the server by means of a URL (Universal Resource Locator).
The WWW may also be used for databases queries. The user communicates with the system by filling a form. These forms are interpreted by a CGI script (Common Gateway Interface) which translates to the system the user request. A graphical type of CGI interface is known as Image maps. This system allows the use of Hyper-regions within an image which may be easily selected by the user by a mouse. Each region will connect the user with another location in a similar way as the Hypertext does.
This paper describes the design of two different gateways to allow a remote user gaining access to ORACLE database and ARC/INFO Geographical Information System. The advantages in the use of the WWW as a user interface are: