I can see a user in AL08, but I cannot find that user in table USR41.

I believe I have an active logged in user.  I can see the user in AL08, but when I look in SE16 at table USR41, I cannot find that user.  Is that "normal"?  I am trying to find the users terminal ID with function TERMINAL_ID_GET.  This function looks in USR41.  Is there some reason a user record in USR41 would drop out of the USR41 table? 

Thank you, Jay