  We prove that in the backward orbit of a non-preperiodic point under the
action of a Drinfeld module of generic characteristic there exist at most
finitely many points S-integral with respect to another nonpreperiodic point.
This provides the answer (in positive characteristic) to a question raised by
Sookdeo. We also prove that for each nontorsion point z, there exist at most
finitely many torsion points which are S-integral with respect to z. This
proves a question raised by Tucker and the author, and it gives the analogue of
Ih's conjecture for Drinfeld modules.
