Enable / Disable Command prompt extensions
If the Windows 2000 / Windows XP or windows 2003 Command Extensions are enabled the PROMPT command supports the following additional formatting characters:   $+   zero or more plus sign (+) characters depending upon the        depth of the PUSHD directory stack, one character for each        level pushed.    $M   Displays the remote name associated with the current drive        letter or the empty string if current drive is not a network        drive.
To enable or disable the command prompt extension in Windows 2000 or Windows XP, use the following registry hack: 
 Hive: HKEY_CURRENT_USER 
Key: Software\Microsoft\Command Processor 
Name: EnableExtensions 
Type: REG_DWORD
Value: 1 enable
Value: 0 disable
  
 You can enable/disable the extensions for the command shell you are in by issuing the following commands: 
cmd /y disables command extensions for this cmd session 
cmd /x enables command extensions for this cmd session 
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