  We scan the parameter space of the NMSSM for the observability of at least
one Higgs boson at the LHC with $300\fbi$ integrated luminosity, taking the
present LEP2 constraints into account. We restrict the scan to those regions of
parameter space for which Higgs boson decays to other Higgs bosons and/or
supersymmetric particles are kinematically forbidden. We find that if
$WW$-fusion detection modes for a light Higgs boson are not taken into account,
then there are still significant regions in the scanned portion of the NMSSM
parameter space where no Higgs boson can be observed at the $5\sigma$ level,
despite the recent improvements in ATLAS and CMS procedures and techniques and
even if we combine all non-fusion discovery channels. However, if the
$WW$-fusion detection modes are included using the current theoretical study
estimates, then we find that for all scanned points at least one of the NMSSM
Higgs bosons will be detected. If the estimated $300\fbi$ significances for
ATLAS and CMS are combined, one can also achieve $5\sigma$ signals after
combining just the non-$WW$-fusion channels signals. We present the parameters
of several particularly difficult points, and discuss the complementary roles
played by different modes. We conclude that the LHC will discover at least one
NMSSM Higgs boson unless there are large branching ratios for decays to SUSY
particles and/or to other Higgs bosons.
