Hi John,
Select a property node from the "Application Control" palette. The node will default to VI Server Class "Application." Right click and select "Properties -> Display -> Primary Display." This property will give you the bounds of the primary display (left, top, right, bottom).
In certain situations I find it more useful than "screen resolution" when dealing with dual head machines, and it also takes into account the taskbar size.
Good luck,
Duffey