numbersix

mounting an ISO image file in Solaris 8:

# /usr/sbin/lofiadm -a /path/to/iso/file /dev/lofi/1
# mount -F hsfs /dev/lofi/1 /path/to/mount/point

don't forget to remove the lofi device after you unmount:

# umount /path/to/mount/point
# /usr/sbin/lofiadm -d /dev/lofi/1

# man lofiadm

for more details

FreeBSD equivalent is nicely documented in the handbook.