As with any DLL, if you're going to call the functions in it using static (load time) linking (which I recommend you try) you need to compile your references to the DLL functions from within your CVI application using the supplied .h file, and then bind the import library .lib file to your application, then have the DLL installed where your application can find it (putting it into the same folder as your application is a good place).
You should add the .h and the .lib files to your CVI application's project. You don't have to add the DLL file itself, it's found by the operating system when you start your application (if you're using static binding which I recommend).
As to the purpose of each function, and what order to call the functions, what parameter values to use, etc., you have to learn that from the supplier of the DLL. There should be some sort of programmer's guide or manual supplied with the DLL.
There's another recent thread on the forum about linking to DLL's, and the CVI website has a tutuorial on DLL's, though in your case you don't need to create a DLL, you're just trying to use one.
Good luck.
Menchar
