  Using the Klein correspondence, regular parallelisms of PG(3,R) have been
described by Betten and Riesinger in terms of a dual object, called a
hyperflock determining (hfd) line set. In the special case where this set has a
span of dimension 3, a second dualization leads to a more convenient object,
called a generalized star of lines. Both constructions have later been
simplified by the author. Here we refine our simplified approach in order to
obtain similar results for regular parallelisms of oriented lines. As a
consequence, we can demonstrate that for oriented parallelisms, as we call
them, there are distinctly more possibilities than in the non-oriented case.
The proofs require a thorough analysis of orientation in projective spaces (as
manifolds and as lattices) and in projective planes and, in particular, in
translation planes. This is used in order to handle continuous families of
oriented regular spreads in terms of the Klein model of PG(3,R). This turns out
to be quite subtle. Even the definition of suitable classes of dual objects
modeling oriented parallelisms is not so obvious.
