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OPC Automation through VBA

OPC Automation through VBA

OPC Automation through VBA

This may be a total shot in the dark, but... I'm trying to learn how to work with OPC data access (DA) and historical data access (HDA).  I'm coming accross a lot of .dll files for OPC automation.  Does anyone know where I can find a breakdown of what these .dll files do?  I know that I need to add some of these as reference libraries but I'm having trouble determining which are the ones that I need, or will I need all of them?  Among those found are:

OPC Foundation:

From Matrikon:

Is anybody familiar with these, or with OPC Automatioc through VBA?

Well, You can try banging your head against the wall, but you just end up with lost-time injuries and damaged equipment. [M. Passman]

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