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Update 01-prerequisites.md 

I'd like to propose this change simply because when I was first attempting to get tmux up and running I thought what I was supposed to be typing was "synchronize-panes: " then hitting ctrl+b and shift and :. I've never used tmux, although have used screen before so once I realized they were essentially the same thing I felt much more comfortable with everything, but while trying to get going with the tutorial it felt bad failing at something before I even started. It proves to be invaluable later on in the tutorial so I would hate for someone else to go through the same thing. I was thinking maybe an image of how the screen changes and what it looks like when you've successfully completed the steps might be helpful. Something like : https://photos.app.goo.gl/buC41xzCEcQeDqSR8

The "shift+:" change I'm a little less committed to; my thinking here was that it didn't register in my head as a key sequence and looked more like something I was supposed to write out.
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mikenadal 2018-11-05 16:10:27 -08:00 committed by GitHub
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@ -46,12 +46,12 @@ gcloud config set compute/zone us-west1-c
## Running Commands in Parallel with tmux
[tmux](https://github.com/tmux/tmux/wiki) can be used to run commands on multiple compute instances at the same time. Labs in this tutorial may require running the same commands across multiple compute instances, in those cases consider using tmux and splitting a window into multiple panes with `synchronize-panes` enabled to speed up the provisioning process.
[tmux](https://github.com/tmux/tmux/wiki) can be used to run commands on multiple compute instances at the same time. Labs in this tutorial may require running the same commands across multiple compute instances, in those cases consider using tmux and splitting a window into multiple panes with synchronize-panes enabled to speed up the provisioning process.
> The use of tmux is optional and not required to complete this tutorial.
![tmux screenshot](images/tmux-screenshot.png)
> Enable `synchronize-panes`: `ctrl+b` then `shift :`. Then type `set synchronize-panes on` at the prompt. To disable synchronization: `set synchronize-panes off`.
> Enable synchronize-panes: `ctrl+b` then `shift+:`. Then type `set synchronize-panes on` at the prompt. To disable synchronization: `set synchronize-panes off`.
Next: [Installing the Client Tools](02-client-tools.md)