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	Category	Difficulty	Refers
Custom Unit Guide	Developing Custom Units	Advanced	Custom Unit
How to deal with BLOBs	Developing Custom Units	Advanced	Custom Unit
How to debug the code of a custom unit inside the Web application	Developing Custom Units	Advanced	Custom Unit Web Application
How to implement a custom database Metadata provider	Data Model	Advanced	WebRatio
How to integrate the single sign on in a WebRatio application	Integration	Advanced	Web Application
Querying with Hibernate	Developing Custom Units	Advanced	Custom Unit