You could use some high resolution time -
use Time::HiRes qw(gettimeofday);
$id = gettimeofday();
or if you've got time on your hands -
use Digest::MD5 qw(md5_hex);
use Time::HiRes qw(gettimeofday);
$id = md5_hex(gettimeofday());
Although you'll may have to download them from CPAN (here's Digest::MD5 and Time::HiRes)
HTH
broquaint
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