d is used to remove the page and LINK/UNLINK methods are for attaching new links or removing links between two Web pages. 6.6.11.3 Hypertext Markup Language (HTML) HTML is a page-descriptive language that allows the user to navigate through a text with the help of links. The HTML document is created by providing different parts of text with markers, for instance <TITLE>. Pic- tures and links to other documents are also marked and included in a HTML document. Some word processors are able to produce an HTML document from any written text document. The term hypertext refers to a capability to provide new information about a word or phrase by clicking it. The term markup comes from the old days when copyeditors actually marked up a document to tell to the printer which font to use. Data Communications A proper Web page consists of a head and body enclosed by <HTML> and </HTML> tags (formatting commands) [3]. The head starts with <HEAD> and ends with </HEAD>. The main item in the header is the title, delimited by <TITLE> and </TITLE> and is usually shown at the upper part of the browser screen. It may be the official name of the owner of the (home) page, for example, the name of the person or company that created the page. As we saw, HTTP provides a command that fetches only the heads of Web pages, SO the head should briefly mention what this page is for. The body of the page starts with tag <BODY> and ends with </BODY>. Figure 6.57 shows an example of the .html (or .htm) text file and how it appears on the browser's screen. <A> and </A> create the anchor, which defines a link. A URL is placed into the first tag and text to be displayed between tags. On the screen display, we see that the text is then underlined, and probably in color, to indicate that the user may click it to move to a new page. Table 6.3 shows a selection of common HTML tags. There are many others and many tags have additional parameters that are not discussed here. Headings are generated by <Hn>, </Hn> and H1 represents the highest-level header an