  Thanks to the ever increasing computational power and the development of more
sophisticated algorithms, numerical N-body simulations are now uncovering
several phenomenological relations between the physical properties of dark
matter haloes in position and velocity space. It is the aim of the present work
to investigate in detail the dynamical structure of dark matter haloes, as well
as its possible dependence on mass and its evolution with redshift up to z=5.
We use high-resolution cosmological simulations of individual objects to
compute the radially-averaged profiles of several quantities, scaled by the
radius Rmax at which the circular velocity attains its maximum value, Vmax. No
systematic dependence on mass or cosmic epoch are found within Rmax, and all
the different radial profiles are well fit by simple analytical models.
However, our results suggest that several properties are not `universal'
outside this radius. [Abridged]
