open SSG, "<ADRX.ssg" || die "can\'t open ADRX.ssg";

# is the equivalent of saying:

open(SSG, ("<ADRX.ssg" || die "can\'t open ADRX.ssg"));


##</code><code>##

open(SSG, "<ADRX.ssg") || die "can\'t open ADRX.ssg";

open SSG, "<ADRX.ssg" or die "can\'t open ADRX.ssg";