Variable  Sample Typical Value  
%SystemDrive%  
C:  
%SystemRoot%  
C:\WINNT
C:\WINDOWS
%SystemDirectory%  
C:\WINNT\System32
C:\WINDOWS\System32
%WinDir%  
C:\WINNT
C:\WINDOWS
____  C:\WINNT\Program Files  
%ComSpec%  
C:\WINNT\system32\cmd.exe  
%Temp%  
C:\DOCUME~1\Usr\LOCALS~1\Temp from
C:\Documents and Settings\Usr\Local Settings\Temp
%Tmp%  
%HOMEDRIVE%  
C: The drive letter associated with the user's home directory  
%HOMEPATH%  
The path to the user's home directory (excluding drive):
\Documents and Settings\Guest  
%OS%  
Windows_NT
The operating system the user is running  
%USERDOMAIN%  
The name of the domain that contains the user's account  
%USERNAME%  
The user's name