Web applications can be considered as a specific variant of client—server software where the client software is downloaded to the client machine when visiting the relevant web page, using standard procedures such as HTTP. Client web software updates may happen each time the web page is visited. During the session, the web browser interprets and displays the pages, and acts as the universal client for any web application. In the early days of the Web , each individual web page was delivered to the client as a static document, but the sequence of pages could still provide an interactive experience, as user input was returned through web form elements embedded in the page markup.
However, every significant change to the web page required a round trip back to the server to refresh the entire page. In , Netscape introduced a client-side scripting language called JavaScript allowing programmers to add some dynamic elements to the user interface that ran on the client side. In , Macromedia introduced Flash , a vector animation player that could be added to browsers as a plug-in to embed animations on the web pages. It allowed the use of a scripting language to program interactions on the client side with no need to communicate with the server.
In , the "web application" concept was introduced in the Java language in the Servlet Specification version 2. In , the term Ajax was coined, and applications like Gmail started to make their client sides more and more interactive. In , HTML5 was finalized, which provides graphic and multimedia capabilities without the need of client side plug-ins.
HTML5 also enriched the semantic content of documents. These have significant importance in creating truly platform and browser independent rich web applications. Through Java , JavaScript , DHTML , Flash , Silverlight and other technologies, application-specific methods such as drawing on the screen, playing audio, and access to the keyboard and mouse are all possible.
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Many services have worked to combine all of these into a more familiar interface that adopts the appearance of an operating system. General purpose techniques such as drag and drop are also supported by these technologies. Web developers often use client-side scripting to add functionality, especially to create an interactive experience that does not require page reloading. Recently, technologies have been developed to coordinate client-side scripting with server-side technologies such as ASP. Ajax , a web development technique using a combination of various technologies, is an example of technology which creates a more interactive experience.
Applications are usually broken into logical chunks called "tiers", where every tier is assigned a role. For more complex applications, a 3-tier solution may fall short, and it may be beneficial to use an n-tiered approach, where the greatest benefit is breaking the business logic, which resides on the application tier, into a more fine-grained model.
This allows the underlying database to be replaced without making any change to the other tiers. There are some who view a web application as a two-tier architecture. Photo — You will upload your photo while completing the online Form DS Your photo must be in the format explained in the Photograph Requirements. Interviews are generally required for visa applicants with certain limited exceptions below. Consular officers may require an interview of any visa applicant. You may schedule your interview at another U. Embassy or Consulate, but be aware that it may be more difficult to qualify for a visa outside of the country where you live.
Wait times for interview appointments vary by location, season, and visa category, so you should apply for your visa early. Review the interview wait time for the location where you will apply: Check the estimated wait time for a nonimmigrant visa interview appointment at a U.
Fees - Pay the non-refundable visa application fee , if you are required to pay it before your interview. If your visa is approved, you may also need to pay a visa issuance fee, if applicable to your nationality. Fee information is provided below: Review the instructions for how to apply for a visa on the website of the U. Embassy or Consulate where you will apply. Additional documents may be requested to establish if you are qualified. For example, additional requested documents may include evidence of:.
If you cannot cover all the costs for your trip, you may show evidence that another person will cover some or all costs for your trip.
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Visa applicants must qualify on the basis of the applicant's residence and ties abroad, rather than assurances from U. A letter of invitation or Affidavit of Support is not needed to apply for a visitor visa. If you choose to bring a letter of invitation or Affidavit of Support to your interview, please remember it is not one of the factors used in determining whether to issue or deny the visa. A consular officer will interview you to determine whether you are qualified to receive a visitor visa.
You must establish that you meet the requirements under U. Ink-free, digital fingerprint scans are taken as part of the application process.
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They are usually taken during your interview, but this varies based on location. The consular officer will inform you if this required. A visa allows a foreign citizen to travel to a U. A visa does not guarantee entry into the United States. Any multiple entry visa that was voided due to being out of status will not be valid for future entries into the United States.
Failure to depart the United States on time may also result in you being ineligible for visas in the future. If your plans change while in the United States for example, you marry a U. However, once you depart the United States you must apply for a new visa at a U. Embassy or Consulate in the appropriate category for your travel. There is no guarantee you will be issued a visa. Short descriptions of fossil remains.
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