  A general formulation of classical relativistic particle mechanics is
presented, with an emphasis on the fact that superluminal velocities and
nonlocal interactions are compatible with relativity. Then a manifestly
relativistic-covariant formulation of relativistic quantum mechanics (QM) of
fixed number of particles (with or without spin) is presented, based on
many-time wave functions and the spacetime probabilistic interpretation. These
results are used to formulate the Bohmian interpretation of relativistic QM in
a manifestly relativistic-covariant form. The results are also generalized to
quantum field theory (QFT), where quantum states are represented by wave
functions depending on an infinite number of spacetime coordinates. The
corresponding Bohmian interpretation of QFT describes an infinite number of
particle trajectories. Even though the particle trajectories are continuous,
the appearance of creation and destruction of a finite number of particles
results from quantum theory of measurements describing entanglement with
particle detectors.
