Pre-Populate Login Form?

Hi,

Putting the security concerns aside, is there a way to create a URL that pre-populates the login window? (or automatically logs in the user)? I've read through the knack form on creating URL variables (https://support.knack.com/hc/en-us/articles/115000997068-How-to-Use-URL-Variables-to-Pre-Populate-a-Form) but it doesn't seem to work with the login window. Perhaps I'm not able to identify the proper view_* or field_* numbers per these instructions? Thank you for any advice.