for PDP-8 software at Digital Equipment Corporation (DEC) in Maynard, MA, used the terms "bug" and "feature" in her reporting of test results to distinguish between undocumented actions of delivered software products that were unacceptable and tolerable, respectively. This usage may have been perpetuated. Undocumented features themselves have become a major feature of computer games. Developers often include various cheats and other special features ("easter eggs") that are not explained in the packaged material, but have become part of the "buzz" about the game on the Internet and among gamers. The undocumented features of foreign games are often elements that were not localized from their native language. Closed source APIs can also have undocumented functions that are not generally known. These are sometimes used to gain a commercial advantage over third-party software by providing additional information or better performance to the application provider. See also Backdoor (computing) Easter egg (media) References Software anomalies Technical communication