You can have unlimited users with access to unlimited regions.
Next, those users can log in via the website (login box in the top right corner of the page), and then access those regions that they have access to by selecting the "Manage Site" menu option once they're logged in.
Allow clients to edit only specific regions, right through their web browser.
Enable students editors on a school website to update their own regions.
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Image Credits - A big thank you to Mateusz Kantowski for the wonderful photographs displayed in the header of our web page. Mateusz ( mathijas86 ) has licensed the images under the Creative Commons Attribution 2.0 Generic (CC BY 2.0). image 1 / image 2 / image 3