How to identify users without asking for their name?

i need a way for us to identify who is submitting the form but i don;t to ask their name everytime they use the form because its impersonal and my customers wont like it. Is there away for them to stay logged in?

You may consider this unique ID widget, which lets you attach an alphanumeric code to every form submission you receive. Here is a demo.

Let us know if you need further assistance.