who can explain vod hds-vod ?

     In fms.ini

          VOD_COMMON_DIR = d:\Program Files\Adobe\Flash Media Server 4.5\webroot\vod

          VOD_DIR = d:\Program Files\Adobe\Flash Media Server 4.5\applications\vod\media

     In Apache httpd.conf

          DocumentRoot "../webroot"

     <Location /vod>

         HttpStreamingContentPath "../webroot/vod"

     </Location>

     <Location /hls-vod>

          HttpStreamingContentPath "../webroot/vod"

     </Location>

     Which path is used, when I used "http://localhost:8134/vod/xxx.mp4" to play?

     I change the path  to

     <Location /vod>

         HttpStreamingContentPath "D:\"

     </Location>

     There have no file In the path "D:\" .

     I used  "http://localhost:8134/vod/xxx.mp4" to play, why  the player still play the xxx.mp4?

     I am confused.

     Who can help me to explain these path mean?

     thanks!