Environ( "Temp" )

Environ( "Temp" ) returns the windows temp path. You can use the 'SET' command from a cmd window in windows to view all the envionment variables, e.g.
        HOMEDRIVE=C:
        HOMEPATH=\Documents and Settings\Jakob Majkilde
        LOGONSERVER=\\MAJKILDE-LAPTOP
        NUMBER_OF_PROCESSORS=2
        OS=Windows_NT