&' means `turn the next line into keywords'. Note the space
before the `&' sign.
Since `&' is a keyword, it must be preceeded by a
space. A ` &' on line 1 would mean that a second line of
keywords should be read in.
If that second line contained a ` &',
then a third line of keywords would be read in.
If the first line has a ` &' then the first
description line is omitted,
if the second line has a ` &', then both
description lines are omitted.
Examples: Use of one `&'
VECTORS DENSITY RESTART & NLLSQ T=1H SCFCRT=1.D-8 DUMP=30M ITRY=300 PM3 FOCK OPEN(2,2) ROOT=3 SINGLET SHIFT=30
Test on a totally weird system: Use of two `&'s
LARGE=-10 & DRC=4.0 T=1H SCFCRT=1.D-8 DUMP=30M ITRY=300 SHIFT=30 PM3 OPEN(2,2) ROOT=3 SINGLET NOANCI ANALYT T-PRIORITY=0.5 & LET GEO-OK VELOCITY KINETIC=5.0