Accessing System variables

I need the value of one of the NT system variables from under ASP (VB Script) ... does anyone know how to do this??

I know its a stupid thing to need to do but i have been asked

I finally worked out how to do it.

set WshShell = CreateObject("WScript.Shell")
strWebTemp = "c:\webtemp"
getTempFilename = WshShell.ExpandEnvironmentStrings("%webtemp%")
set WshShell = nothing


Thanks anyway guys