The HDANSrv OPC HDA server toolkit consists of two parts:
    - The generic OPC HDA V1.2 compliant COM server
    - The .NET assemblies with the application specific database access handling

The customization is split into two layers:
    - Base layer with the basic data handling that fits most applications
    - Database access that handles the application specific database and content structure 

The two customization .Net assemblies are supplied as a C# and VB.Net code for a database with the data in text files, a file for each item.
The sample implementation is tested for OPC HDA V1.2 compliance and can be used as the base for custom servers.
Some implementations may only require changes in the database access layer, not influencing the OPC HDA compliant data handling.
More complex implementation and performance optimizations may require changes in the data handling code. Such changes must be done in a way to maintain the standard compliancy.