custom user management

[Christian Sell]

Hi there,

I want to customize orions authentication mechanism to use an existing user
database. So far, I understand that I have to create my own UserManager
class and register it in orion-application.xml. What I dont understand is:

- how do I access the user manager at runtime (e.g., to create users)
- how do I perform programmatical login (bypassing the login-config from
web.xml, e.g. from a home page with a login field)

any hints, URLs?

TIA,
Christian