Commands that work:
 launch           - launch a new instance of xmms
 play             - play the current song in the playlist
 stop             - stop playing
 pause            - pause current song
 prev             - goto previous in playlist
 next             - goto next in playlist
 play_pause       - pause if playing, play if pausing
 eject            - show file window
 quit             - quit current xmms session
 main [0|1]       - toggle/show/hide main window
 playlist [0|1]   - toggle/show/hide playlist window
 equalizer        - toggle/show/hide equalizer window
 clear_playlist   - clear playlist
 vol [+|-]percent - raise/lower/set volume
 time [+|-]time   - forward/backward/set time
 add_url <url>    - add an url such as file:/mnt/cf
 play_or_next     - if playing, goto next, if stopped, play current
 stop_or_prev     - if stopped, goto previous, if playing, stop
