These are drivers for the HP instrumentation provided with each test station. These drivers can be copied and modified to create your own instrument interface. These drivers use the VISA (Virtual Instrument Software Architecture) interface library to create the instruments. To try them out:
If you are looking for simple models to follow that do not use VISA's then checkout C:\LABVIEW\INSTR.LIB\MODELS\ in this directory are sample VIs that do not use VISAs to communicate to the instruments. These may be helpful when learning about Labview.
For extra help, you may want to checkout the National Instruments web site
http://www.ni.com/support/lvsupp.htm