Will at least one of the Higgs bosons of the next-to-minimal   supersymmetric extension of the Standard Model be observable at LEP2 or the   LHC?
  We demonstrate that there are regions of parameter space in the next-to-minimal (i.e. two-Higgs-doublet, one-Higgs-singlet superfield) supersymmetric extension of the SM for which none of the Higgs bosons are observable either at LEP2 with $\sqrt{s}=192 GeV$ and an integrated luminosity of $L=1000 inverse pb$ or at the LHC with $L=600 inverse fb$. 
J.F. Gunion (U.C. Davis), H.E. Haber (U.C. Santa Cruz) and T. Moroi   (LBL)