Hello,
I'm not sure if you purchased it with Windows XP or no OS (in which case someone installed one), but the feature you are looking for is likely going to depend on the OS. You should look for an OS call to shutdown or power down the device, but the call is not going to be specific to LabVIEW, and I don't think it's already implemented. You'll most likely be looking for a windows dll/function which provides this functionality (hopefully the dll which contains it exports this function). You will then use a call library function node in LabVIEW to call the dll function - the same object you use in LabVIEW to call any dll function.
I hope this helps!
Best Regards,
JLS
