  We show that in the Minimal Supersymmetric Standard Model, the possibility
for the lightest CP-even Higgs boson to be lighter than $Z$ boson (as low as
about 60 GeV) is, contrary to the usual belief, not yet excluded by LEP2 data
or any other existing experimental data. The characteristic of the light Higgs
boson scenario (LHS) is that the $ZZh$ coupling and the decay branching ratio
${\rm Br}(h/A\to b\bar{b})$ are simultaneously suppressed as a result of
generic supersymmetric loop corrections. Consequently, the $W^\pm H^\mp h$
coupling has to be large due to the sum rule of Higgs couplings to weak gauge
bosons. In addition to discussing the potential of the Tevatron and
$B$-factories to test the LHS, we show that the associate neutral and charged
Higgs boson production process, $pp\to H^\pm h (A)$, can completely probe LHS
at the CERN Large Hadron Collider.
