A 4 picosecond, 53 TIP3P water molecules, constant temperature (300 K),
contant pressure (1 bar) simulation. Atoms interact with Lennard-Jones
and Coulomb potentials.  Integration is done with Verlet integrator.

To run this example, type the following at the command line:

python runH2O.py wat53.pdb H2O.pdb

First note which platform is being used.
Next note the Potential Energy, which should be less
than (more negative than) -2000 kilojoule/mole after
a few picoseconds.

Once the simulation is done, you can use a program like
VMD to visualize the result.  To do this, first start the
VMD application, then open H2O.pdb (File->New Molecule...).