If Command Extensions are enabled the PROMPT command supports the following additional formatting characters: $+ zero or ...

If 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.