Abercrombie France,VIRTUAL PROGRAMMING LAB FOR ON-

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VIRTUAL PROGRAMMING LAB FOR ON-LINE DISTANCE LEARNING (below)

The CSA can be designed as a proxy object to a normal Web browser. To configure the Web browser to enable the WebVL, the user simply configures his / her browser to use locally executed CSA daemon by setting the proxy server as 127.0.1 or localhost. The CSA acts as a mediator between the Web browser's normal Http request / reply and WebVL services on the network. This approach requires no re-invent of a new Web browser. Various task-scheduling techniques with load sharing can be used by the CSA to dispatch the student's request to a suitable site in the WebVL environment for connection. There are several solutions to the problem of providing transparent access to scalable services provided by a group of servers and sharing the load between the different servers . Examples are DNS Aliasing,[link widoczny dla zalogowanych],[link widoczny dla zalogowanych], HTTP redirect, Magic Routers, fail-safe TCP and Active Networks [Ami98, Car99, Yos97]. The interaction between the student and the software is largely supported by Web server and client extensions. Information and feedback can be facilitated by HTML push / pull mechanisms and techniques for local processing of small, embedded applications such as Java Applet. On the other hand, techniques based on the use of forms within HTML documents to let clients initiate and interact with server-side applications enable us to create appropriate tools that can interface Web browsers to software applications. For example, using the forms facility and CGI scripts (Common Gateway Interface), we can build CSA on the Lab servers which provide runtime services to WebVL related requests / replies . The CGI script in Java is called Java servlets, which are Java programs that run in a Java-enabled web server in response to an HTTP request. The web server runs the servlet, and the servlet outputs an HTML page that the server returns to the client [Cam99]. Depending on the lab software to be accessed, the functions of the CGI / Java servlet programs can be as simple as invoking a local command line or shell script program, or as complex as interfacing a sophisticated, interactive software. A given lab software can be accessed from a command embedded in an HTML document. From the student's point of view, he / she simply follows a link that can cause a WWW server to execute a program or a shell script, which, in turn, can spawn a process / thread that will handle the interactions with the distinct student. The server-side agent, implemented as a cgi-bin or Java servlet program,[link widoczny dla zalogowanych], runs during the whole session and is responsible of interfacing the student with the local software program. It obtains the student provided information, such as program commands,[link widoczny dla zalogowanych], code, parameters, etc, from the fill-out forms, processes it if necessary, and then passes it to the software in the required format. For example, the student can submit Java code for execution in a text area within an HTML form; the server side agent would save the code to disk, attempt to compile the code and, if compilation was successful, run the executable file on some test data. When the output is produced by the software, the server-side agent sends the output to the student, most probably as HTML documents that are dynamically generated. These HTML documents may be just simple text files, or contains fields that have to be filled by the student and then transmitted back to the software program,[link widoczny dla zalogowanych], or links to actual sites of the software vendors. It can also contain embedded links that lead to other executable programs. Figure 6 illustrates the above interaction scheme in WebVL. Note that CGI scripts don't have to be invoked by forms; they can be invoked directly by a web browser. By utilizing the information expression that Web browsers and the CSTP support, various forms of multimedia data as output from the software can be saved and communicated about over the Web [Nei96]. For accessing lab help facilities such as programming manuals and help files, due to the ease of interfacing with external viewers in WWW browsers, different types of documents can be viewed by using the viewing programs associated to the various types. This has the advantage of extensibility: new types can be defined with appropriate viewers if necessary. Thus, when the student requests to read help files or programming manuals in the software packages, the WWW browsers will retrieve the documents and launch the corresponding viewer for the display .
Figure 6: Interaction of components in WebVL For implementing the CSTP, we propose to use HTTP as the baseline protocol by extending relevant HTTP headers and the support for the transfer of WebVL specific headers, control information, and data formats . Potentially we can develop a new specification of XML-based [Kha97, Lau99] CSTP transfer syntax. This approach has the advantage of being conforming to standards and portable to various platforms. We are also considering the use of mobile agents in the development of WebVL. A mobile agent is a computer program that can autonomously migrate between network sites, ie, it can execute at a host for a while, halts execution, dispatches itself (together with its data and execution state) to another host, and resumes execution there - all under its own control [Lan99]. It has been found that mobile agent is especially suitable for structuring and coordinating distributed applications running in a wide-area environment like the Internet [Que99]. In our case, for example , mobile agents can be employed to locate the requested software for programming exercises, to collect load information at individual Web servers, and / or to automatically and transparently determine for the client the agents can also be sent by either the client or the server to perform local interactions or display information at the peer site.

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Club Clothing For Your Night Out
Club Clothing For Your Night Out by Robert Scott
in [url=/category/shopping/]Shopping[/url] / [url=/category/shopping/clothing/]Clothing[/url] (submitted 2010-08-13)

Club clothing depends a lot on how well you visualize yourself than how much you can shed from your pocket.
When the question of a night out in a club arises, different women come up with different opinion for club clothing. There are a lot of women who are quite confused of what will be a right buy for a club wear. People interested in nightlife and regularly enjoying it have different and definitive dress codes that they follow. Such dress codes mainly comprise of no codes, or more clearly they are more interested in getting into the mood with something stunning to look at and fashionable enough to wear on a dance floor. However, all that said women who regularly visit nightclubs have a certain code of dressing that they follow in accordance to what can be carried by them with maximum style and grace.
Club clothing can most definitely be depending on your personal choice. There are no such hard and fast set of rules and restrictions against wearing any particular dress style. However [link widoczny dla zalogowanych], it is better still to wear according to your comfort level. For example a nightclub has a fun environment all around that inspires you to jump and dance and make fun. Now, in such an environment it is not suggestive for you to wear long sleeved shirts, or other attires that can get you feel too sweaty and uncomfortable. You should ideally be quite careful while choosing your club wear. This is because of the fact that these clubs are full with different people from almost all the classy segments of the society [link widoczny dla zalogowanych], unless of course it is quite a cheap club to hangout. But of course you will maintain your class so in all those high ranked clubs wearing a proper clothing combination becomes extremely necessary for you to maintain your image.
[link widoczny dla zalogowanych] does not only include the outfit you wear to the nightclub [link widoczny dla zalogowanych], but your whole attire. It completely includes your footwear [link widoczny dla zalogowanych], your hairstyle, the accessories you are carrying and how well you use them, along with a good composed and balanced make-up that compliments your complete attire. You may as well be wearing the right kind of pants and look extremely sexy in them, rather than going for any other outfit. You can visit the internet to get a good amount of choice in club wears and night outs. In fact price is not the constraint at all. These outfits come at quite an affordable price.

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