Copyright Goodheart-Willcox Co., Inc. Chapter 1 Introduction to Information Technology 19 More Actions Scroll bar moves the page up and down Share button Back button: displays the previous page Forward button: displays the next page New tab: opens a new, blank tab Current tab: tab navigation allows multiple tabs to be open Hub button: displays favorites, reading list, history, and downloads Navigator bar: shows or accepts a URL Web Note button Goodheart-Willcox Publisher Figure 1-15. The basic layout of the Microsoft Edge screen. programs are also known as web browsers, browsers now offer many abilities beyond surfi ng the World Wide Web. Examples of browsers are Chrome, Internet Explorer, Safari, and Firefox, among others. Figure 1-15 illustrates the main features of the Microsoft Edge browser. While computing has been a human need for thousands of years, electronic digital computers have existed for less than a century. Starting in 1945 with the development of the Electronic Numerical Integrator and Computer (ENIAC), the digital age was born. The leaders of the design team for the first programmable digital computer were J. Presper Eckert and John Mauchly at the University of Pennsylvania. They conceived the idea for using vacuum tubes to represent the on-off digital values. The calculations required 36 vacuum tubes to represent a single digit. Once the ENIAC was completed and tested, it was used at Aberdeen Proving Ground in Maryland to perform ballistics calculations. The first programmers were Kay McNulty, Betty Jennings, Betty Snyder, Marlyn Wescoff, Fran Bilas, and Ruth Lichterman. Titans of Technology