I'm not sure this is possible. Really, the only way to call a VI are from VIServer or ActiveX. Since you don't have LabVIEW on the other machine, that won't work, and you can't use DCOM from a non Windows machine. There might be a 3rd party application like PCanywhere that will work between environments, but I doubt it. Your best chance might be to rig it so that LabVIEW works as a TCP/IP server and will respond to commands by using the TCP VI's. That should be easy enough to use from a UNIX system.