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Controlling motion of a charged particle is to control its phase space, in particular the momentum part. Particle with relativistic velocity is one model, when owing to relativistic effects the phase space is almost stationary, except for translational degrees of freedom. Relativistic motion is an example of the universal recipe to control motion of, charged, particles; they should be confined to a small volume of space and then manipulated by electromagnetic field. Confinement is achieved by static and time dependent magnetic field and electromagnetic waves of various properties. Extreme confinement of charges when their motion is in the relativistic regime, have specific features that are manifested in distribution of their momenta and energies when the system decays, and also in distribution of charges densities within the bound system, for which two body Dirac equation is used.