Quite cumbersome really, and so much more difficult to plan.
Here, for example, they might say tomorrow is people aged 48. Then anybody aged 48 can show up at any vaccination centre, prove their age and get vaccinated. It works pretty well.
And because there are so many vaccinations centres then they load balance pretty easily.
In fact, if Chile had chosen Pfizer or AZ it'd have all been done and dusted by now. Sadly they chose Sinovac which introduces a 6 week delay before protection is achieved. Which properly screwed them up. The fact that they didn't know didn't help.
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