CS2K Integration

Hi, Can anybody help on following integration issues: 1. How do Navision and Commerce Server 2002 interact with each other without BizTalk Server? 2. Can Commerce Server invoke C/FRONT API? (If Yes, What’s the Architecture?) 3. Would there be any Navision Client to be installed on Commerce Server? 4. How does Commece Server 2002 business triggers activate Navision? 5. Does Navision Support Biztalk 2004 for interaction with CS2K? Thanks Manoj