Colin,
Assuming you just want to control a single VI, then you probably want to use remote panels with a Web browser.
On the lab PC, you need to enable the LabVIEW Web server (Tools >> Options, Web Server Configuration). Then, for the VI that you want to remotely control via a Web browser, open it up and choose Tools >> Web Publishing Tool. That wizard will step you through the process of saving an HTML file that you will then be able to access from a Web browser to control the VI.
You should read up on these things in the LabVIEW documentation, but this is the general idea. Another thing to consider is whether you should just remotely control the whole computer. With Windows XP professional on the lab machine, this is trivial to do using Windows Remote Desktop. Other options such as VNC can be employed as well.
Regards,
John
