Laptop sharing
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A laptop sharing manager could be a variant of a calendar application or cooperate with a calendar application.
The sharing manager would allow two or three pupils living close to each other to share one laptop with well-defined usage time during the day. The sharing schedule could rotate over one, two or three weeks, so that every pupil would have the opportunity to have the laptop e.g. on a sunday.
The laptop sharing manager could warn a pupil about remaining usage time and automatically log out the pupil at the time when the pupil would have to give the laptop to the next pupil, only accepting the password of this pupil for the next login.
This could be especially useful for the least developed countries, which may not be able to pay for more than one laptop for three pupils (or even less than that [OLPC investment funds])
Teachers
The laptop sharing manager should probably be able to synchronize with an application for teachers with which teachers could demand the presence of a laptop for certain classes.