[opencms-dev] Application development in OpenCMS

[pieter claassen]

I am about to start developing an application and would like to consider
using OpenCMS as framework. However, I have the following questions:

1. Is there a manual or tutorial that covers application development in
OpenCMS? Specifically user authentication, authorisation, database
access etc?
2. How does one develop a user authentication system?
3. Is there something like JDO to access data in OpenCMS or what are the
alternatives (JDBC?)

Thanks,
Pieter