Comunication of protocols A communications protocol is a formal description of digital message formats and the rules for exchanging those messages in or between computing systems and in telecommunications. Protocols may include signaling, authentication and error detection and correction capabilities. A protocol describes the syntax, semantics, and synchronization of communication and may be implemented in hardware or software, or both .
TCP/IP The TCP/IP model is a description framework for computer network protocols created in the 1970s by DARPA, an agency of the United States Department of Defense. It evolved from ARPANET, which was the world's first wide area network and a predecessor of the Internet. The TCP/IP Model is sometimes called the Internet Model or the DoD Model. The TCP/IP model, or Internet Protocol Suite, describes a set of general design guidelines and implementations of specific networking protocols to enable computers to communicate over a network. TCP/IP provides end-to-end connectivity specifying how data should be formatted, addressed, transmitted, routed and received at the destination. Protocols exist for a variety of different types of communication services between computers. TCP/IP has four abstraction layers as defined in RFC 1122. This layer architecture is often compared with the seven-layer OSI Reference Model; using terms such as Internet reference model, incorrectly, however, because it is descriptive while the OSI Reference Model was intended to be prescriptive, hence being a reference model. The TCP/IP model and related protocols are maintained by the Internet Engineering Task Force (IETF).
POP3 In computing, the Post Office Protocol (POP) is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection. POP and IMAP (Internet Message Access Protocol) are the two most prevalent Internet standard protocols for e-mail retrieval. Virtually all modern e-mail clients and servers support both. The POP protocol has been developed through several versions, with version 3 (POP3) being the current standard. Like IMAP, POP3 is supported by most webmail services such as Hotmail, Gmail and Yah oo! Ma il.
SMTP Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission across Internet Protocol (IP) networks. SMTP was first defined by RFC 821 (1982, eventually declared STD 10), and last updated by RFC 5321 (2008) which includes the extended SMTP (ESMTP) additions, and is the protocol in widespread use today. SMTP is specified for outgoing mail transport and uses TCP port 25. The protocol for new submissions is effectively the same as SMTP, but it uses port 587 instead. SMTP connections secured by SSL are known by the shorthand SMTPS, though SMTPS is not a protocol in its own right. While electronic mail servers and other mail transfer agents use SMTP to send and receive mail messages, user-level client mail applications typically only use SMTP for sending messages to a mail server for relaying. For receiving messages, client applications usually use either the Post Office Protocol (POP) or the Internet Message Access Protocol (IMAP) or a proprietary system (such as Microsoft Exchange or Lotus Notes/Domino) to access their mail box accounts on a mail server . SMTP
WHAT IS A HYPERLINK In computing, a hyperlink (or link) is a reference to a document that the reader can directly follow, or that is followed automatically. A hyperlink points to a whole document or to a specific element within a document. Hypertext is text with hyperlinks. A software system for viewing and creating hypertext is a hypertext system, and to create a hyperlink is to hyperlink (or simply to link). A user following hyperlinks is said to navigate or browse the hypertext. A hyperlink has an anchor, which is the location within a document from which the hyperlink can be followed; the document containing a hyperlink is known as its source document. The target of a hyperlink is the document, or location within a document, to which the hyperlink leads. Users can activate and follow the link when its anchor is shown, usually by touching or clicking on the anchor with a pointing device. Following the link has the effect of displaying its target, often with its context.
WHO TO INSERT HYPERLINK IN IMPRESS When inserting text (such as a website addresses or URL) that can be used as a hyperlink, Impress formats it automatically, creating the hyperlink and applying to the text a color and underlining. If you do not want OOo to do that, select Edit > Undo Insert from the menu bar or press Control+Z immediately after the formatting has been applied. You can also insert hyperlinks manually. Tips To prevent OOo from automatically turning website addresses (URLs) into hyperlinks, go to Tools > AutoCorrect > Options and deselect the URL Recognition checkbox. To change the color of hyperlinks, go to Tools > Options > OpenOffice.org > Appearance, scroll to Unvisited links and/or Visited links, select the checkboxes, pick the new colors and click OK. Caution: this will change the color for all hyperlinks in all components of OpenOffice.org—this may not be what you want. To insert a hyperlink, or to customize the appearance of a hyperlink, select Insert > Hyperlinks from the menu bar. The dialog shown in Figure 50 opens.
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3D AND 2D ANIMATION IMPON IS SA ITYLLY OUTSTANDING TOOT FOR CREATING EFFECTIVE MULTIMEDIA PRESENTATTIONS
AUTOSHAPES THE AUTOSHAPES IS TOOL YO HELP YOU DRAW OBJECTS IN YOUR DOCUMENTS
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