great ideia
Variable = Typical value (May vary, depending on system)
%ALLUSERSPROFILE% = C:\Documents and Settings\All Users
%APPDATA% = C:\Documents and Settings\{username}\Application Data
%COMPUTERNAME% {computername}
%COMSPEC% = C:\Windows\System32\cmd.exe
%HOMEDRIVE% = C:
%HOMEPATH% = \Documents and Settings\{username}
%PATH% = C:\Windows\System32\;C:\Windows\;C:\Windows\System32\Wbem
%PATHEXT% .COM; .EXE; .BAT; .CMD; .VBS; .VBE; .JS ; .WSF: .WSH
%PROGRAMFILES% = Directory containing program files, usually C:\Program Files
%PROMPT% = Code for current command prompt format. Code is usually $P$G
%SYSTEMDRIVE% The drive containing the Windows XP root directory, usually C:
%SYSTEMROOT% = The Windows XP root directory, usually C:\Windows
%TEMP% and %TMP% = C:\DOCUME~1\{username}\LOCALS~1\Temp
%USERNAME% {username}
%USERPROFILE% = C:\Documents and Settings\{username}
%WINDIR% = C:\Windows