  We use numerical simulations and semi-analytical methods to investigate the
stability and the interactions of nontopological stationary qball solutions. In
the context of a simple model we map the parameter sectors of stability for a
single qball and verify the result using numerical simulations of time
evolution. The system of two interacting qballs is also studied in one and two
space dimensions. We find that the system generically performs breather type
oscillations with frequency equal to the difference of the internal qball
frequencies. This result is shown to be consistent with the form of the qball
interaction potential. Finally we perform simulations of qball scattering and
show that the right angle scattering effect observed in topological soliton
scattering in two dimensions, persists also in the case of qballs where no
topologically conserved quantities are present. For relativistic collision
velocities the qball charge is split into a forward and a right angle
scattering component. As the collision velocity increases, the forward
component gets amplified at the expense of the right angle component.
  The animated simulations of this study may be found on-line at the address
http://leandros.chem.demokritos.gr/qballs/index.html
