Windows Shortcut Directory Scripting

%USERPROFILE%\My Documents\Downloads\ = C:\Documents and Settings\Administrator\My Documents\Downloads

%APPDATA%\Mozilla\Firefox\Profiles\ = C:\Documents and Settings\Administrator\Application Data\Mozilla\Firefox\Profiles

%Systemroot%\System32\GroupPolicy = C:\WINDOWS\System32

http://en.wikipedia.org/wiki/Environment_variable 

http://best-windows.vlaurie.com/environment-variables.html 

http://windows7tips.com/environment-variables-windows-vista-7.html 

http://www.digitalcoding.com/Code-Snippets/VB/Visual-Basic-Code-Snippet-Access-current-environment-directories-and-logical-drives.html 

and finally, i am searching the other