Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Right now, I have my laptop using two screens: the laptop screen and 2nd monitor. The 2nd monitor extends the desktop. I would like to be able to hook up a 3rd monitor to duplicate only what the 2nd screen displays. Is this possible and if so, how?

share|improve this question
This is impossible to answer properly without knowing the model of the laptop and the operating system installed (well, it is possible to answer, but the answer is "maybe"). You could probably do it with a splitter in the worst case but that maybe isn't needed. – Shinrai Feb 6 '13 at 17:20
There are a few laptops that can support 3 monitors natively. For example, anything with Nvidia Optimus (there may be exceptions to that, but my XPS l502x works fine). – Marcus Chan Feb 7 '13 at 4:59
up vote 1 down vote accepted

Logically speaking, you should be able get a splitter that takes the input going to the screen you want to duplicate and gives the signal to both monitors. Identical or near identical monitors may be necessary.

Many video cards support 2 monitor outputs max (even if they have say 4 connections) which is most likely the case with a laptop.

ie, something like this:

share|improve this answer
Thanks Shinrai and Enigma. I had a feeling that using a splitter was the answer. Just wasn't sure. – ukus Feb 6 '13 at 17:33
You could go as far as doing something like this:… - or some other external video card solution. – Enigma Feb 6 '13 at 17:36

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.