DHD

Device that controls the Stargate, more commonly known as the D.H.D. The dial-home device, constructed by the Ancients, has 38 of the 39 symbols on its Stargate (minus the point of origin), allowing the user to "dial" any desired destination. Despite the advanced technology, the device has a limited power supply. Unlike the dialing computer, the D.H.D. does not require the inner track of the Stargate to unlock and spin in order to establish a wormhole. Instead, it is capable of "quick dialing," where pressing the seven glyphs on the D.H.D. are all that are needed to open a gateway.

In case of an overload, the master control crystal can be removed and reinstalled. If a pattern was held in the memory buffer without being reintegrated by the receiving gate, this process will allow the person or item to complete the reintegration process. Periodically, the D.H.D. initiates a correlative update program, in which it automatically dials several nearby Stargates and transmits to their D.H.D.s revised coordinate data, in order compensate for stellar drift and to maintain the uniformity of the system software.

In the Pegasus Galaxy, not all Stargates require a D.H.D. to operate: Space-based gates are powered instead by three power nodes, and dialing is accessed by a panel on a ship. D.H.D.s on planets there, however, are very similar, but with a blue button in the center.