Tia,
The knowledgebase linked below describes our Measurement Hardware Driver Development Kit Register Level Programming (RLP) Architecture. It includes documentation and examples for RLP. Make sure to take a look at links to other documents within this knowledgebase. I hope this helps.
Measurement Hardware Driver Development Kit Register Level Programming Architecture
http://digital.ni.com/public.nsf/websearch/1C3988D7D33B925C86256C59007FB4B4?OpenDocument
Regards,
Todd D.
Applications Engineer
National Instruments