These are some (most) of the windows shotcuts, these pass "hidden folders" and are helpful to give locations when helping peiople.
These ONLY work in RUN.
(Xp: Start > run) (Vista: search Run)
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}
%COMSPEC% C:\Windows\System32\cmd.exe | C:\Windows\System32\cmd.exe
%HOMEDRIVE% C:\ | C:\
%HOMEPATH% C:\Documents and Settings\{username} | C:\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 (no clue what this one is used for)
%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% (VISTA ONLY) C:\Users\Public