Neural interface

A neural interface is a device which allows a user to control a device with their mind. Most usually have some sort of DNA lock to them.

Ancients
Much the most dangerous technology used by the Ancients, such as the control chair and gateships, was keyed to link the nervous system to the technology being used. To access the devices, the user needed the ATA gene, which would initialize the device. Most of the Tau'ri who possess the ATA gene require serious concentration, though Jack O'Neill and John Sheppard have been able to activate Ancient technology with ease. Major Evan Lorne is able to use ancient technology quite well. His abilities seemed to be the closest to those of Jack O'Neill and John Sheppard.

Eurondans
The Eurondans used neural interfaces to control their fighters, being able to control multiple craft at the same time. However, prolonged use of the neural interfaces resulted in brain damage.

Goa'uld
A great deal of the technology used by the Goa'uld can only be activated with their minds, such as the hand device and the hara'kesh. To activate it, the user must have naquadah within their bloodstream. Thus, only hosts and former hosts are able to activate Goa'uld technology. However, most former hosts lack the proper mental training to achieve this.

Ori
The warships of the Ori are keyed to Priors, who control the vessel from a small bridge; the ship's systems cannot be initialized any other way. However, Adria was able to activate the systems from a different room, and Daniel Jackson was able to give Samantha Carter enough information on Ori technology to activate the flight systems. The primary weapon on the warships are activated mentally, and do not need the Prior controlling the vessel to sit in the control chair, but they must be near by.

Wraith
Wraith hive ships must be piloted by a Wraith neural interface, similar to the ATA gene. Those who have Wraith DNA in their systems are capable of piloting the vessel, but it is taxing on the person. The Wraith are also capable of mentally activating some of their technology, such as the cell doors on the hive ships.