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The Dial Home Device (or DHD) is what the Ancients used to activate the Stargate.

Features

Similar to a telephone dial or touch pad (although much larger), the DHD is used to specify which other stargate to connect to when opening a gate or wormhole to another location. The external symbols on the DHD represent star constellations, surrounded by the central activation switch. The DHDs are composed of control crystals, used to store memory and information. The Dial Home Device also contains an update command to account for stellar drift. (SG1: "Children of the Gods", "Solitudes", "Avenger 2.0")

Luckily for those on Earth, the stargate found in Giza was missing its DHD. A computer was programmed to act as the controling device, though it took some fifteen years to creat one. If there had been a DHD with that first rediscovered stargate, we probably would have run into the Goa'uld in the 1920's before we ready to handle it (barely). (Film) (SG1: "Children of the Gods")

Puddle jumpers and Wraith Darts are equipped with DHDs (SGA: "Rising")

Types of DHDs

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