Few questions regarding Shibboleth and SAML

[Moonlight]

Hi,
I would be grateful if sb answer following questions very briefly. I have
read SAML and Shibboleth documentations. I need to be sure I have understood
everything correctly.
- How does IdP store the information about earlier successful
authentication. 
- On which endpoint the authorization decision assertion is exchanged.
- Why it is mentioned in shibboleth wiki that server side code running in a
web application needs ECP profile.

Best regards,
Mona



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