  Twin photons from spontaneous parametric down-conversion with preselected
polarization are used as spatially disjoint subsystems. One photon is subject
to an interference measurement, while a projective measurement of the second
photon induces the way-choice of the first photon. This would be an example of
way-choice free of direct action on the interfering photon. Two further
applications of the proposed scheme are considered: a new method of quantum
information speed measurement, and a test of commutation of space-like remote
measurements.
