# How to do computations simultaneously in multiple notebooks? [duplicate]

I have a Mathematica script which takes a few hours to run. I want to be able to open another notebook while it's running and do some other computations. I have enough many cores on my computer for this to be possible so it shouldn't be an issue.

What do I need to configure so I can be running several notebook scripts in parallel?

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## marked as duplicate by Sjoerd C. de Vries, Michael E2, m_goldberg, Kuba, Yves KlettAug 20 '13 at 18:58

The question is indeed a duplicate, but for some reason I like this answer a bit more. –  Ajasja Aug 20 '13 at 10:02

Go to Evaluation->Kernel configuration options and add a local Kernel (name it "2nd Kernel" or something). Then, in your second notebook, select in Evaluation->Notebooks kernel the kernel you just added. Your license must support additional kernels.

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Ahh great, thanks a lot! You're my saviour :) –  Haffi112 Aug 20 '13 at 9:31
@Haffi112 You can also upvote together with an accept if it fits your needs :) –  Kuba Aug 20 '13 at 9:33
The upvote requires 15 reputations and I only have 13 >_< I'll keep it in mind :) –  Haffi112 Aug 20 '13 at 9:41
If you're using a second kernel, it is not necessary to set the notebook's default context. It's not harmful...the two items are simply not related to one another. –  John Fultz Aug 20 '13 at 10:23
Absolutely right, I'll fix it –  Volker Aug 20 '13 at 10:47