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  1. or download this
    my $UIDholder = "some value";
my $var_ref = \$UIDholder;
print "UIDHolder: $UIDholder\n";
print "reference: $var_ref\n";
  2. or download this
    UIDholder: some value
reference: SCALAR(0x8160e8c)
  3. or download this
    print "Actual value of variable: $$var_ref\n";