TEMP
A TEMP environment variable is set by your autoexec.bat file when you start your system. Generally, TEMP points to an area on your hard disk used by Microsoft Windows and other programs, like the Microsoft Jet database engine, to store information that doesn't need to be saved after you shut down your system. For example, the following line in your autoexec.bat file points the TEMP environment variable to the D:\TempArea folder:
SET TEMP=D:\TempArea