In order to program your PXI-5670, you need only interface with the NI-RFSG driver via the VC++ ADE.
During installation, you need to select 'LabWindows/CVI Support' to be installed as in the attached screenshot. This is required to install the necessray C/C++ support files. If you have already installed NI-RFSG 1.0, you can run the repair option from Add/Remove Programs.
The header file you need to include is:
niRFSG.h
located at:
C:\VXIPNP\WinNT\include
The import library file you need to include is:
niRFSG.lib
located at:
C:\VXIPNP\WinNT\lib\msc
A VI is a Virtual Instrument and refers to a program written in National Instruments' LabVIEW graphical ADE.
If you are developing an application in VC++, then you will not be interfacing to
any VIs.
You will need to install the drivers on any computer you wish to compile and link on.