Many things are doable in LabVIEW. LabVIEW is as much a programming language as C is. Thus, you can do what you ask for. In fact, there's an example that ships with LabVIEW that does something very close to what you're asking. Open the Example Finder and search for "dialog".
As for the Windows domain directory verification, are you operating within Active Directory, or the old NT domain model? Did you try a search? The easiest solution is to use .NET. A VI
was posted in this thread.
To learn more about LabVIEW it is recommended that you go through the tutorial(s) and look over the material in the NI Developer Zone's Learning Center which provides links to other materials and other tutorials. You can also take the online courses for free.
