GP Question about Central Store

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On the episode you stated a single DC environment really doesn't need a central store, however, I have a few questions about this.

1. If you have a single DC and you do not setup a central store how to do go in and load ADM and ADMX files?
2. If you DO have a single DC environment and a central store wasn't created from the get go can you go back in and create it after the fact? -- After GP's have already been put in place?
3. Is it a good idea to have a central store even on a single DC environment for future expansion?

Thanks!

@justin-makosky
I would always create a central store even in a one DC environment.
Imagine the following example:
You got 5 admins on 5 workstations. You want them to use a admx file for configuring gpos that hadle Office 2013 behavior.
With central store you just have to copy the admx files to your sysvol central store folder. All admins can use the same same set on policys at once.
Without central store you have to copy the admx files to the lokal store of all 5 workstations.