BW 2.1C: Bex Analyzer query

Hi, I'm a beginner starting out developing in a BW 2.1C. I have good ABAP skills but limited experience in developing within BW.

I have a requirement to execute a BEx Analzyer Query in an ABAP program. I need to write the query results data to a flat file for transmission to a Cognos system.

Thanks, Inde