Is it possible to provide RFCs (remote function calls, aka remote procedure calls) as web services with SAP 4.6C?
This is not directly possible (not as simply as ECC6, at least)
you can either create a custom webservice that call the RFC and expose it, or use the SAP Business Connector that expose RFC-enabled function and BAPI as webservice. This tool is available to download from SAP service.
regards,
Guillaume