Windows 系統環境變數

%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
%PROMPT%        Code for current command prompt format. Code is usually $P$G
%SYSTEMDRIVE%        The drive containing the Windows root directory
%SYSTEMROOT%        The Windows root directory
%TEMP% and %TMP%    C:\DOCUME~1\{username}\LOCALS~1\Temp
%USERNAME%        {username}
%USERPROFILE%        C:\Documents and Settings\{username}
%WINDIR%        C:\Windows

%DATE%  當前日期
%TIME%  目前時間
%CD%    目前目錄
%ERRORLEVEL%    錯誤碼
%RANDOM%    Random number between 0 and 32767