A few useful environment variables ....

%ALLUSERSPROFILE% .... C:\Documents and Settings\All Users

%APPDATA% .... C:\Documents and Settings\{username}\Application Data

%PROGRAMFILES% .... directory containing program files, usually C:\Program Files

%SYSTEMDRIVE% .... drive containing the Windows root directory, usually C:\

%SYSTEMROOT% .... Windows root directory, usually C:\Windows

%TEMP% .... C:\DOCUME~1\{username}\LOCALS~1\Temp

%USERPROFILE% .... C:\Documents and Settings\{username}

%WINDIR% .... C:\Windows

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