** no need in special backup routines, everything is shared from the beginning and implicitly
** no need in special backup routines, everything is shared from the beginning and implicitly
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== Conception ==
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# object + tag + time = action, i.e., each action has duration
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# everything is on server
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# objects and actions might have tags
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# parental relationships for actions, action threads
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# the same objects might be used in several actions, objects have different states associated with different actions - object's history.
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# all (j)object are composite, they have different history for different users
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# action thread loops, useful for teachers since they teach the same from year to year and having a chance to compare what they do at this moment a year ago is useful