Here are some examples of how to do commands without using XML. In the examples below, it is assumed that the address of your player on the network is "http://empeg", substitute the correct address for this as needed.

To access the built-in HTML playlists of Hijack (no XML), the command is:
http://empeg/?fid=101&ext=.html
From there, you can stream, download, or play any tune or playlist on the player.

Play
http://empeg/?serial=%20&nodata

Pause
http://empeg/?serial=W&nodata

Fast Forward
http://empeg/?button=Right.L&nodata

Rewind
http://empeg/?button=Left.L&nodata

Next Track
http://empeg/?button=NextTrack&nodata

Previous Track
http://empeg/?button=PrevTrack&nodata

Volume Up
http://empeg/?button=VolUp.L&nodata

Volume Down
http://empeg/?button=VolDown.L&nodata

Info Mode
http://empeg/?button=Info&nodata

Next Visual
http://empeg/?button=Visual&nodata

Toggle Shuffle
http://empeg/?button=Shuffle&nodata

Sleep
http://empeg/?button=Top.L&nodata

I haven't tried all of these out, I was just pulling code from CharcoalGray99's page. No warranty on the above items, expressed or implied.