In the case your laptop or device originally had internet, but then temporarily loses connection, our website on the "sign in" page, will temporarily store everything on the page while enabling you to still use the page to sign people in locally (local storage). Therefore this allows people to be signed in without internet! Note: You would have to make sure you have internet so that the information transfers over and the Red text "Sign in Locally" will turn into "Signed In".
Below is an example:
The "Signed In" text means the data is synchronized over when internet was available.
When the internet was not available, and you still "signed" people in, you will have the text "Signed in Locally".