How does the NVidia G-SYNC Pendulum Demo toggle G-Sync

The NVidia G-SYNC Pendulum Demo (Download Cool NVIDIA Demos | NVIDIA Cool Stuff) toggles G-Sync. How does it do this? With NVAPI? Can’t be using NvAPI_GSync_EnumSyncDevices since this is for Quadro cards only. How does it do it for GeForce cards?

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