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The goal of the Protostellar Outflows at the EarliesT Stages (POETS) surveyis to image the disk-outflow interface on scales of 10-100 au in astatistically significant sample (36) of luminous young stellar objects (YSO),targeting both the molecular and ionized components of the outflows. Theoutflow kinematics is studied at milliarcsecond scales through VLBIobservations of the 22 GHz water masers. We employed the JVLA at 6, 13, and 22GHz in the A- and B-Array configurations to determine the spatial structure andthe spectral index of the radio continuum emission. In about half of thetargets, the water masers observed at separation <= 1000 au from the YSOs traceeither or both of these kinematic structures: 1) a spatially elongateddistribution oriented at close angle with the direction of collimation of themaser proper motions (PM), and 2) a linear LSR velocity (Vlsr) gradient acrossthe YSO position. The kinematic structure (1) is readily interpreted in termsof a protostellar jet, as confirmed in some targets via the comparison withindependent observations of the YSO jets, in thermal (continuum and line)emissions, reported in the literature. The kinematic structure (2) isinterpreted in terms of a disk-wind (DW) seen almost edge-on on the basis ofseveral pieces of evidence: first, it is invariably directed perpendicular tothe YSO jet; second, it agrees in orientation and polarity with the Vlsrgradient in thermal emissions (when reported in the literature) identifying theYSO disk at scales of <= 1000~au; third, the PMs of the masers delineating theVlsr gradients hint at flow motions at a speed of 10-20 km/s directed at largeangles with the disk midplane. In the remaining targets, the maser PMs are notcollimated but rather tend to align along two almost perpendicular directions,and could originate in DW-jet systems slightly inclined (<= 30 deg) withrespect to edge-on.

Protostellar Outflows at the EarliesT Stages (POETS). III. H2O masers tracing disk-winds and jets near luminous YSOs