A Gen's nager originates with the production of excess selyn in every living cell. The Sime's nager originates from the motion of selyn from nerve-cell to nerve-cell (across synapse gaps) and the consumption of selyn in each living cell. Thus a Sime's "nager" is distinctively different from a Gen's "nager." A channel (with their Dual Selyn System and selyn-storing nerve networks) has a nager that is more complex. A channel can "project" a "showfield" that belies the internal condition of the channel, whereas a renSime can not do that.
A channel can also affect the aggregate of the fields of other people in a vicinity, (the ambient ) to change the way that summation of the nager of every renSime, channel, Gen zlins to others in the vicinity, "managing the fields."