Anonymous Username Under Show Logged in Users in the Developer Portal

I have 3 users marked with Anonymous at the beginning of their username. Where can i get detail of those users? And do we get Anonymous users.   My application logging is running a loop on user log in some time and cause the heap to go out  of memory  
1 answers

Anonymous users are users who visit your application without logging in. They are created automatically by your application.

I hope this helps.