Environment variables are a set of named values that affects the way running processes will behave on a computer depending on the variable stored. The environment variable with a standard name can designate the particular location on a computer system - this may vary from one computer system to another.
Default Values on Microsoft Windows
| Variable | Windows XP/Vista/7/8 |
| %ALLUSERSPROFILE% and %PROGRAMDATA% | C:\Documents and Settings\All Users C:\ProgramData |
| %APPDATA% | C:\Documents and Settings\{username}\Application Data C:\Users\{username\AppData\Roaming |
| %COMPUTERNAME% | {computername} |
| %COMMONPROGRAMFILES% | C:\Program Files\Common Files |
| %COMMONPROGRAMFILES(x86)% | C:\Program Files (x86)\Common Files |
| %COMSPEC% | C:\Windows\System32\cmd.exe |
| %HOMEDRIVE% | c: |
| %HOMEPATH% | \Documents and Settings\{username} |
| %LOCALAPPDATA% | C:\Users\{username}\AppData\Local |
| %LOGONSERVER% | \\{domain_logon_server} |
| %PATH% | 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 |
| %PROGRAMDATA% | %SystemDrive%\ProgramData |
| %PROGRAMFILES% | %SystemDrive%\Program Files |
| %PROGRAMFILES(X86)% | %SystemDrive%\Program Files (x86) (only in 64-bit version) |
| %PROMPT% | Code for current command prompt format. Code is usually $P$G |
| %PSModulePath% | %SystemRoot%\system32\WindowsPowerShell\v1.0\Modules\ |
| %PUBLIC% | %SystemDrive%\Users\Public |
| {Drive}:\$Recycle.Bin | C:\Recycle.Bin |
| %SystemDrive% | c: |
| %SystemRoot% | The Windows directory, usually C:\Windows, formerly C:\WINNT |
| %TEMP% and %TMP% | %SystemDrive%\Documents and Settings\{username}\Local Settings\Temp %SystemDrive%\Users\{username}\AppData\Local\Temp |
| %USERDOMAIN% | {userdomain} |
| %USERNAME% | {username} |
| %USERPROFILE% | %SystemDrive%\Documents and Settings\{username} %SystemDrive%\Users\{username} |
| %WINDIR% | C:\Windows |
Source: http://en.wikipedia.org/wiki/Environment_variable
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