The dream interface device was a form of technology developed by the Tau'ri by reverse engineering the Virtual reality pods of the Volsinii.
When Dr. Rodney McKay was infected with an entity from the Crystalline species of M3X-387, Colonel Samantha Carter realized they could use the components of the VR pods to connect to Rodney's dream state. Lt. Colonel John Sheppard entered McKay's mind and the two of them were able to defeat the entity. (SGA: "Doppelganger")
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