The optional fifth argument is a pointer to an associative array
relating the checkbox values to the user-visible labels that will
be printed next to them (-labels).  
##</code><code>##

a pointer to an associative array
relating the checkbox values to the user-visible labels
##</code><code>##

my %checkbox_items = (
    a => 'BillJ may have been assigned as trustee to the security object which gives him supervisor rights over all NDS objects',
    b => 'BillJ may be wearing pink pyjamas when he comes round the mountain',
    c => 'BillJ may be the first man to orbit Mars on a unicycle',
    d => 'BillJ may be just another Perl hacker',
);
##</code><code>##

my @checkbox_values = keys %checkbox_items;

##</code><code>##

print
    start_html,
    checkbox_group(
        -name      => 'testing',
        -values    => \@checkbox_values,
        -linebreak => 1,
        -labels    => \%checkbox_items,
    ),

##</code><code>##

<input type="checkbox" name="testing" value="a" />
BillJ may have been assigned as trustee to the security object which gives him supervisor rights over all NDS objects
<br />

<input type="checkbox" name="testing" value="b" />
BillJ may be wearing pink pyjamas when he comes round the mountain
<br />

<input type="checkbox" name="testing" value="c" />
BillJ may be the first man to orbit Mars on a unicycle
<br />

<input type="checkbox" name="testing" value="d" />
BillJ may be just another Perl hacker
<br />