  We evaluate the coordinate space dependence of the matrix elements of the
commutator of the electromagnetic and gluon currents in the vicinity of the
light-cone but at large distances within the parton model, DGLAP, the
resummation approaches to the small x behaviour of DIS processes, and for the
Unitarity Bound. We find that an increase of the commutator with relative
distance $py$ as $\propto (py)f(py,y^2=t^2-r^2)$ is the generic property of QCD
at small but fixed space-time interval $y^2=t^2-r^2$ in perturbative and
nonperturbative QCD regimes. We explain that the factor $py$ follows within the
dipole model (QCD factorization theorem) from the properties of Lorents
transformation. The increase of $f(r)$ disappeares at central impact parameters
if cross section of DIS may achieve the Unitarity Limit. We argue that such
long range forces are hardly consistent with thermodynamic equilibrium while a
Unitarity Limit may signal equilibration. Possible implications of this new
long range interaction are briefly discussed.
