Any code editor capable of developing HTML pages; alternatively, a plain text editor, such as Windows Notepad; Windows XP, Vista, or 7, and Mac OS X; Internet access, e-mail, the Microsoft Internet Explorer or Mozilla Firefox Web browser, and the Adobe Flash and PDF plug-ins (two free and simple downloads you obtain at http://www.adobe.com/downloads by clicking Get Adobe Flash Player and Get Adobe Reader); access to multiple browsers, including Safari, Netscape Navigator, Google Chrome, and Opera; access to a Web server that supports JavaScript and PHP.