.Net to SAP User info needed?

Hi Gurus,

In our current landscape, we have .net application users accessing sap data and they update this sap data via bapi, while updating the same all the .net users use a generic user id.

EX: The user logs in to .NET as u201CXYZu201D but he updates the sap data as PQUSER (generic id).

Going forward, we would like to use the same .net user id XYZ to communicate with SAP (and not via generic id), so that, we can track as to who has updated the sap data in reality, how can we achieve this either in 4.6c / ecc 6.0?

Any help would be greatly appreciated!!

Best Regards,

Govind.