Nizan,
I believe it would require the using of the C/C++ DLL Adapter to call the appropriate functions in that DLL. For more information on using the C/C++ adapter, see Chapters 4 and 5 of the TestStand 3.0 Reference Manual (in the TestStand Bookshelf -- Help >> Search the TestStand Bookshelf).
Matt P.
Applications Engineer
National Instruments