How keep track of caller from web page or app in your EJB

I want to make a Security Handler for my EJB Server. I want apps / users to be able to log in. However, after they log in (for example from a web page), how do I keep track of who they are when they then make subsequent calls to EJBs?
Where can I find out who they are?
How do I standardize this for apps and web page callers?
I know that for web servers to keep track of who the caller is for them, they need to store a handle on the client. Do I need to do this too?
If I do keep smth on the client side that they send back/forth to me, does that not fit with the EJB standards?

still unable to find answer. Hey, can I also ask: do I ask too obscure questions? I don't get most of them answered. Are they boring?

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