You need to elaborate, if you want to write Progress code to access both a Progress and Oracle database refer to you Progress Documentation CD and look at
OpenEdge Data Management: DataServer for ORACLE
If you want to access a Progress database with proSQL or some other tool/language you will use ODBC or JDBC, look at
OpenEdge Data Management: SQL Development
You should have received the documentation cd with Progress, if not available is should be on the Progress web site
