Sinoatrial node. The sinoatrial node (SAN; also known as sinus node) is a group of cells located in the wall of the right atrium of the heart.
How Do Web Browsers Work? The World Wide Web is a system of Internet servers that support specially formatted documents. Web browsers are used to make it easy to access the World Wide Web. Browsers are able to display Web pages largely in part to an underlying Web protocol called HyperText Transfer Protocol (HTTP).
To demonstrate a common usage of a popular protocol, we can examine the Internet's TCP /IP protocol. Computers can communicate different types of information over TCP/IP such as text, pictures, VOIP (Voice Over Internet Protocol), and more.o indicate that a user wants the page protocol.html from the What-Is-What website, the web browser Firefox connects to the What-Is-What server and sends this information: GET /what_is/protocol.html HTTP/1.1.