Oracle Client namespace

Question

I'm new to .Net using a Oracle backend. Up until now I've always used a SQL Server backend. I have several questions that I hope someone can answer and help me out. 1. What is a REF Cursor? 2. Do you have to use a Ref Cursor to bring back data from a stored procedure and populate a dataset? 3. Can someone show me code on how to call a stored procedure in a Oracle database utilizing the Oracle Client Namespace? Thanks In Advance ALR