The 
collider proposed in 1990 [1]
is now being built at the Laboratori Nazionali di
Frascati of INFN.
will run in 1997 at the center of mass energy
of the 
meson with an initial luminosity of 
, and a final target luminosity one order of magnitude larger.
The 
(1020) meson
is produced in collisions with a peak cross section
which translates in a production rate of
from initial to target luminosity, with a 30:1 S/N ratio over the hadronic production.
The 
then decays [2] at rest in 
(49%), 
(34%), 
(13%), 
(2.5%)
and 
(1.3%). Therefore a 
-factory is a unique source of
monochromatic (110 and 127 MeV/c respectively), collinear,
quantum-defined and tagged neutral and charged kaons.
Detecting one K out of
the two produced in the 
decay determines existence and direction of the
other ("tagging").
An overview of the FINUDA detector is given, as well as of
its physics issues, a status report, and construction schedule.