Hi. I want to implement a online todo list on my website, where anyone who uses the site can check a box when one of the listed task have been done. When they do that, I don't want to use login, instead I want them to sign by their first name behind the taskbox. When someone have checked a box, and signed, I want the task to become uncheckable but stil visible to other users who later visit the site. How can I do this by php?