  The transverse spin effects may be helpful to distinguish between scalar
(J^{PC}=0^{++}) or pseudoscalar (J^{PC}=0^{-+}) nature of the spin zero (Higgs)
particle once discovered in future accelerator experiments. The correlations
can manifest themselves e.g. in distribution of acollinearity angle of X^{+-}
in decay chain H/A -> tau^+ tau^- ; tau^{+-} -> nu X^{+-}. This delicate
measurement will require however reconstruction of the Higgs boson rest-frame.
Then, questions of the combined detector-theoretical effects may be critical to
establish reliability of the method. Appropriate Monte Carlo program is
essential.
  In the present paper we extend the standard universal interface, of the
TAUOLA tau-lepton decay library, to include the complete spin effects for tau
leptons originating from the spin zero particle. As usual, the interface is
expected to work with any Monte Carlo generator providing Higgs boson
production, and subsequent decay into pair of tau leptons.
  Some example of numerical results and cross checks of the program, will be
also given.
