A user is enabled to assign channel numbers to his favorite content, including TV stations, Internet sites, local applications, and recorded content. A system is disclosed for performing the method. Also a method of reducing the genesis of oligodendrocytes, neurons, astroglial cells from progenitor cells or stem cells, wherein a pharmaceutically effective amount of a substance that will lead to a decreased concentration of growth hormone or a functionally equivalent analogue thereof is administered to said patient.