Hi friends, I need help with a workaround.

My users are not on Zoho, so I have a simple login form to determine if they are registered to use our appointment system. 

they enter a login (their email) and password in a stateless form .  If that email is in our database with the correct password, the login form sends them to a url with a second form to schedule an appointment. 

I needed a way to save the logged in "state" of the user so that when they get to the second form, I know who they are and can display their name and appointments. 

I have name, appointment list, guest IP, and "logged in" check box in guest database.  When guest uses the stateless login form, it records their current IP and checks "logged in" as true in their guest record.  When user gets to the next url with second form, that form looks for their IP in the database, sees if logged in box is true, and then displays the information.  this worked perfectly.

However, most of my users share an IP with other users in the same office, so my idea won't work.  I

can anyone help with an idea for how to retain the "logged in state" of the user from the first form and give that information to the second form after they get to the next the url?