The data can be read in and then printed, but no actual calculation is
performed when this keyword is used. This is useful as a check on the input
data. All obvious errors are trapped, and warning messages
printed.
A second use is to convert from one format to another. The input
geometry is printed in various formats in a 0SCF calculation.
Normally, only the Cartesian coordinate and MOPAC Z-matrix geometries are
printed, however other geometries can also be printed if other keywords are
used, e.g. AIGOUT.