Where visitors in the Service-to-Other keep rapt attention to the thoughts of those who are preparing to give The Call, those in the Service-to-Self find such attention to others not of their liking. They delegate. Their minions, who cannot object on pain of torture, are set to monitor for the signs that someone is giving The Call to the Service-to-Self. This is done not by telepathy but by computer, which traces, surprisingly enough, a brain wave configuration generated when humans are dealing either with rage or intense defensive postures. This brain wave is generated almost continuously in those strongly in the Service-to-Self, as they are constantly enraged that their surroundings aren't placating them! It is not the level of this brain wave that is monitored, it is the constancy, and when located this individual is watched more closely. They may get a specific invitation, periodically, as their brain wave configuration has marked them as one in the Service-to-Self, in essence giving The Call continuously due to their frustration. Of a like mind, one might say.