Windows Environment Variables

Environment Variables from Wikipedia article:

Default Values on Microsoft Windows

Variable	Windows XP	Windows Vista
%ALLUSERSPROFILE%	C:\Documents and Settings\All Users	C:\ProgramData
%APPDATA%	C:\Documents and Settings\{username}\Application Data	C:\Users\{username}\AppData\Roaming
%COMPUTERNAME%	{computername}	{computername}
%COMMONPROGRAMFILES%	C:\Program Files\Common Files	C:\Program Files\Common Files
%COMMONPROGRAMFILES(x86)%	C:\Program Files (x86)\Common Files	C:\Program Files (x86)\Common Files
%COMSPEC%	C:\Windows\System32\cmd.exe	C:\Windows\System32\cmd.exe
%HOMEDRIVE%	C:	C:
%HOMEPATH%	\Documents and Settings\{username}	\Users\{username}
%PATH%	C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;{plus program paths}	C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;{plus program paths}
%PATHEXT%	.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.WSF;.WSH	.com;.exe;.bat;.cmd;.vbs;.vbe;.js;.jse;.wsf;.wsh;.msc
%PROGRAMFILES%	C:\Program Files	C:\Program Files
%PROGRAMFILES(X86)%	C:\Program Files (x86) (only in 64-bit version)	C:\Program Files (x86) (only in 64-bit version)
%PROMPT%	Code for current command prompt format. Code is usually $P$G	Code for current command prompt format. Code is usually $P$G
%SYSTEMDRIVE%	C:	C:
%SystemRoot%	The Windows directory, usually C:\Windows, formerly C:\WINNT	C:\Windows
%TEMP% and %TMP%	C:\Documents and Settings\{username}\Local Settings\Temp	C:\Users\{username}\AppData\Local\Temp
%USERNAME%	{username}	{username}
%USERPROFILE%	C:\Documents and Settings\{username}	C:\Users\{username}
%WINDIR%	C:\Windows	C:\Windows
%PUBLIC%		C:\Users\Public