  A method to calculate reactions in quantum mechanics is outlined. It is
advantageous, in particular, in problems with many open channels of various
nature i.e. when energy is not low. In the method there is no need to specify
reaction channels in a dynamics calculation. These channels come into play at
merely the kinematics level and only after a dynamics calculation is done. This
calculation is of the bound--state type while continuum spectrum states never
enter the game.
