MAC ID is a unique, common identifier enabling single sign-on for a number of McMaster systems and applications.
Your MAC ID is not your employee or student number.
So, you are new to McMaster, and you've been given this thing called a "MAC ID". Now what? In the Getting Started section you will be able to do the following:
From time to time, your account will need a little attention. In the Ongoing Maintenance section, you will be able to do the following. Click here for the MAC ID password strength requirement.