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Here are the VIs we use for Windows authentication and domain groups. Validate Username and Password.vi takes the username and password and returns a TRUE if it validates against the domain controller. User in Group.vi takes a username (or current user if left blank) and a Domain Group name and returns TRUE if the user is a member. User Groups.vi takes a username (or current user if left blank) and returns an array of Domain Groups to which the user belongs. We only use these on our internal network, so I can't guarantee they work in every situation. Still, they may give you a starting point if you need something similar. Pat P.S. LabVIEW 2010sp1 User Groups.vi User in Group.vi Validate Username and Password.vi

You don't; the pull-up resistors keep the level high until told otherwise. You invert the output instead.

I think you can do what you want using VISA. Check out this article: http://digital.ni.com/public.nsf/allkb/B937AC4D8664E37886257206000551CB

The TCP examples are good starting points, so you should probably explain what you're tried so far and what you're actually trying to do - "build a tcp connection project" is uselessly vague.