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What browser add-on/etc will tell me what<br />
&nbsp;1. webserver (IIS, Apache, etc) a website is running AND<br />
&nbsp;2. database (Microsoft SQL server, Oracle, etc) a website is running ?
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What browser add-on/etc will tell me what
 1. webserver (IIS, Apache, etc) a website is running AND
 2. database (Microsoft SQL server, Oracle, etc) a website is running ?

Website's Backend -- software used ?

A web server refers to the software that helps to deliver web content that can be accessed either through the Internet or through an intranet. The primary function of a web server is to store, process and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol (HTTP). The most common use of web servers is to host websites, but there are other uses such as gaming, data storage, running enterprise applications, handling email, FTP, etc.

Web Servers

Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social network services using a wide variety of languages and standards, including the familiar HTML, JavaScript and jQuery, ASP and ASP.NET, PHP, ColdFusion, CSS, PHP, Flex and Flash, but also the implementation of a broad list of standards including XML, WSDL, SSDL, VoiceXML and many more.

Web Languages and Standards

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.