Hello, welcome to <tt>grinch.caltech.edu</tt>.  You are probably looking for one of the tools hosted here.  They are listed below for your convenience:

<ul>
    <li><a href="https://grinch.caltech.edu/register">Registration Tool</a></li>
    <li><a href="https://grinch.caltech.edu/late">Late Tokens Tool</a></li>
    <li><a href="https://grinch.caltech.edu/queue">Office Hours Queue Tool</a></li>
    <li><a href="https://grinch.caltech.edu/quiz/cs11">CS 11 Quiz Tool</a></li>
    <li><a href="https://grinch.caltech.edu/quiz/cs24">CS 24 Quiz Tool</a></li>
    <li><a href="https://grinch.caltech.edu/cs2">CS 2 Grades Tool</a></li>
</ul>