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Since the suppliers of the software usually consider the Software Documentation to constitute a contract for the behavior of the software, undocumented features are generally left unsupported, and may be removed or changed at will and without notice to the users. This makes using undocumented features a double-edged sword.

Sometimes such a feature (for example, the ability to change the Switch character in MS-DOS , usually to a Hyphen ) is included for Compatibility (in this case with Unix utilities) or future-expansion reasons, but the software provider changes their mind or goes out of business; the absence of documentation makes it easier to justify the feature's removal.

In other cases, Software Bug s are referred to jokingly as undocumented features. ("''It's not a bug; it's an undocumented feature!''")

Ironically, undocumented features themselves have become a major feature of '', which just exposes the already existing scripts and models with one bit switch. The undocumented features of foreign games are often elements that were not Localized from their native language.

Closed Source API s can also have undocumented functions that are not generally known. These are sometimes used to gain a commercial advantage over 3rd-party software by providing additional information or better performance to the application provider.


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