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...
Bluetooth is an open wireless technology standard for transmitting fixed and mobile electronic device data over short distances. Bluetooth was introduced in 1994 as a wireless substitute for RS-232 cables.
Bluetooth communicates with a variety of electronic devices and creates personal networks operating within the unlicensed 2.4 GHz band. Operating range is based on device class. A variety of digital devices use Bluetooth, including MP3 players, mobile and peripheral devices and personal computers.
In contrast to other wireless technologies, Bluetooth equips its network and devices with high-level services like file pushing, voice transmission and serial line emulation.
Bluetooth features include:
Bluetooth is used for the following:
The name Bluetooth comes from the Scandinavian word Blåtand/Blåtann, which originated from Harald "Bluetooth" Gormsson I, from Denmark and parts of Norway. He was a king, reined in the tenth century and united discordant Danish tribes into a single kingdom. Bluetooth established the name to indicate that they united communication protocols into one universal standard.
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