From Ardrana

Contact must be established before virtually any telepathic power can be used on another character or creature. It is just what its name implies - contact between the minds of the telepath and another character or creature. Contact does not allow communication by itself; it is merely the conduit for other telepathic exchanges.

A psionicist can maintain contact with more than one subject at a time, but he must contact each one individually. A psionicist cannot contact a subject that he knows nothing about. In other words, he can't use this power to scan around and "see what's out there." He must either have his subject in sight or know specifically who or what he is looking for. Several factors can make telepathic contact difficult to establish: how far the target is (distance), resistance by the target-especially if the target is a psionicist, and whether or not the target is an intelligent mammal

Note: Contact originally appeared in this form in the Complete Psionicist's Handbook for the AD&D game from TSR. Its use here is for the purposes of providing context for the campaign only.