See attached video for an explanation on Chrome's People feature and how you can use it to keep multiple logins on the same computer.
Link: https://goo.gl/xoKixu
Note: This feature is a perk of using google Chrome, and is likely to change in the future.
The best-practice method for having multiple logins on the same computer, is essentially for one Supervisor to give another Supervisor their password.
Supervisors can change their passwords to something that they are comfortable with sharing (see Change Password) and simply tell their password to the relevant Supervisor