Tasks are used for work with documents between the linked users.
The example of using funcion Tasks in praxis could be: "The document owner wants to get input to the document from another user - in Limacta he creates a task with a working copy - it will contain an assignment for another user - responsible person (Assigned to).
Once he solves the task, the creator - requestor of the task can merge the changes in the working copy into the former document.