Referential integrity is a relational database concept, which states that table relationships must always be consistent. In other words, any foreign key field must agree with the primary key that is referenced by the foreign key. Thus, any primary key field changes must be applied to all foreign keys, or not at all. The same restriction also...
Auto-answer is a feature that enables fax machines and modems to give priority to an incoming call. Voice calls are transferred to voice mail or answering machine, so that fax machines and fax modems can automatically answer and receive faxed documents.
The settings for auto-answer feature are often found within the program menu of the cell phone, fax machine or answering. The command for auto-answer in most modems is ATS0=1.
Cell phones may also have an auto-answer feature that is activated after a preprogrammed number of rings.
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