What does the read-only line do :

image=/boot/vmlinuz-2.4.26
label="2. Knoppix(2.4)"
initrd=/boot/initrd.img-2.4.26
append="ramdisk_size=100000 init=/etc/init lang=us apm=power-off nomce quiet lang=us"
read-only

This is from my lilo.conf and was wondering why it has that there. Is there a way to set the windows boot option to read-write?

other=/dev/hda1
label="1. WindowsXP"