  By filtering out the philosophic component we can be said that the EPR-paper
was directed against the straightforward interpretation of the Heisenberg's
uncertainty principle or more generally the Bohr's complementarity principle.
The latter expresses contextuality of quantum measurements: dependence of
measurement's output on the complete experimental arrangement. However, Bell
restructured the EPR-argument against complementarity to justify nonlocal
theories with hidden variables of the Bohmian mechanics' type. Then this Bell's
kind of nonlocality - {\it subquantum nonlocality} - was lifted to the level of
quantum theory - up to the terminology {\it "quantum nonlocality"}. The aim of
this short note is to explain that Bell's test is simply a special {\it test of
local incompatibility of quantum observables}, similar to interference
experiments, e.g., the two-slit experiment.
