Abstract: Management of a user's continued attention to distance learning content using a general purpose computer having a central processing unit and an operating system configured to run multiple program applications concurrently. A memory stores the distance learning content. A distance learning module comprises code executable on the central processing unit, as one of the multiple program applications. The distance learning module presents the distance learning content to a user and is operable to interrupt a presentation of the distance learning content in response to prescribed events concerning another one of the multiple program applications. A method executing on a computer that an concurrently run multiple applications identifies events concerning an application other than the distance learning application, processes the identified events so as to identify a prescribed event among the identified events, and interrupts the presentation of the distance learning content in response to the prescribed event.

Abstract: The invention relates to a method for mechanical processing of pigments or pharmaceutically active substances in the form of particles of raw product. In a first method step, the particles are classified as to size, wherein particles that are classified as fine particles inside the classifier are discharged as acceptable materials and wherein large particles that remain as residual material in the classifier are supplied to a comminuting device, where the particles are comminuted during a second processing step.