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Assuming you're using windows, a quick search for shutdown in the windows help reveals a shutdown command, which you can call in LV using the system exec VI for the communication palette.
There isn't an independant one, so far as I know...but there may be.
What you could do is use System Exec and the "ver" command, to get
the version, and from there use the appropriate command. Windows
XP uses "shutdown -s", while for 2k it's a little more
complicated. See here.
I've never had any experience with 2003 server myself, so I can't help you there.