Applications And Languages Of Scenarios – Make The Site More Attractive.
If it is necessary, that the Web page could do something else, except display of the text and images, it is necessary to include means of support of certain mini-programs in it. From “point of view” of the client they take the form of elements of management ActiveX or Java applets. From “point of view” of a server of the mini-program can use the external interface of the general sluice (CGI – Common Gateway Interface) for the programs stored on a server, or the scenario, which has been built in page by means of pages of an active server (Active Server Pages – ASP) Microsoft.
Client Web-applications.
Client Web-applications and executed files are loaded to the client from a Web-server, but for their performance are used resources of the client computer. Client applications can give such means, as voice communication programs, or other appendices, like that can be reused while the page remains opened.
Language Java. Java is the language applied on many platforms (cross-platform language), is developed by firm Sun Microsystems. Its basic concept is ability to interaction. Java applets are tiny appendices, which can be executed on any platform: DOS, Windows, Unix, Windows NT and many other things. At start, Java applet first of all creates for itself the environment of execution of the program (named a sandbox), and then works already in its context. First, is provided applet performance on any platform as thus is created the operating environment, necessary for the applet. Secondly, the applet cannot affect a base-operating environment at all as it never adjoins to it.
To number of Java applets with which, probably, you could meet, concern Netcaster, entering in Netscape Communicator, and also the schedulers of travel applied in some mobile Web-knots. Netcaster represents means of the external interface used in technology of extraction of the information (pull technology) Netscape (i.e. extraction of contents from Web-knots without an actual input in knots). Schedulers of travel perceive the user installations entered by you, carry out search in a database of the schedule of the flights corresponding to your inquiries, and then return results.
Elements of management ActiveX are similar Java as give a way of joining to Web-pages mini-appendices, however they are completely not identical. Elements ActiveX is not the programming language independent of a platform, and a set of elements of the management, allowing to create applications by means of set of various languages, for example, Delphi, Visual Basic, access to which can be received through a browser. Elements of management ActiveX are executed not in specially created environment, and like any appendix in the user operating environment.
Server Web-appendices.
Server Web-appendices (server-side Web applications) are carried out by a server means of an operational environment (server operating environment), and also at the expense of hardware resources of a server. Server appendices more all remind unitary started applications (one-time applications), such as search engines. Advantage of server appendices consists in their universality. The browser does not have need to support language of client appendices. To storage and loading of such programs apply different lines of thought. Servers CGI get access to the appendices stored on a server while ASP (Active Server Pages – pages of an active server) keeps the scenario, which should be carried out on page HTML.
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