Adobe Shockwave (formerly Macromedia Shockwave) was Macromedia's first and most successful multimedia player prior to the introduction of Macromedia Flash (now Adobe Flash). It allows Adobe Director applications to be published on the Internet and viewed in a web browser by anyone who has the Shockwave plug-in installed. Shockwave is usually authored in the Adobe Director environment. While there is support for including Flash movies inside Shockwave files, authors often choose the Shockwave Director combo over Flash because it offers more features and more powerful tools. Features not replicated by Flash include a much faster rendering engine, including hardware-accelerated 3D, and support for various network protocols, including Internet Relay Chat. Furthermore, Shockwave's functionality can be extended with so-called "Xtras". Although Shockwave was designed for making a wide variety of online movies and animations, its actual use has become concentrated in the area of game development. It is often used in online applications which require a very rich graphical environment. Online Learning tools which simulate real-world physics or involve significant graphing, charting, or calculation will often use Shockwave.