Systems which can't reach ePO or another specified repository will always use the fallback site - you should see a http site listed. For this - the systems would need internet access though.
If nothing else is specified there is an auto update task which will be run on the clients as well.
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Thanks, But essentially when we want is some machines to benefit from our corporate licence but to be used as if it is used at home. straight to the internet, non domain joined, and updating through the internet.