Simple example.
Send command via netcat to the PERL daemon.

[tomekk@zonk]:/home# nc 192.168.0.1 1234
ready
play
ok
pause
ok
stop
ok
play
ok
next
ok
prev
ok
song
Rage Against the Machine - Killing in the Name


Script is using xmms socket and 'Song Change' plugin. [included with xmms 1.2.11 (don't know about prev. versions)]
Look at the screen if You have problems with plugin configuration.

It's very simple :-)