I'm looking to buy new, high end PC laptop, probably Alienware, which will be connected to external monitor most of the time. I'd like to have an option to switch between iGPU and dGPU, depending on used app. The question is:

How does Nvidia Advanced Optimus technology, alongside with G-Sync, work with external display, using different types of connections, like HDMI, Display Port or Thunderbolt ? Any explanations, pls ?