Sikuli is a tool that can automate human tasks like typing and clicking through image recognition. It was used to automatically change 400 subject headings in a library catalog by pasting different terms into a form and submitting it, instead of filling out the form manually 400 times. Sikuli is useful for automating tasks when you don't have access to modify the underlying system code, and for avoiding repetitive work. Users need to be aware that computer and software behavior can sometimes be inconsistent.