1. Download EmpegVNC and install it on the Empeg.
2. Download a PPC VNC client (not sure what a good one is for this).
3. Ensure the PPC and the Empeg are on the same network (wired or wireless)
4. Launch the VNC client on the PPC and you can control the Empeg.

Ezekiel did this with his PPC in this post. He attached a picture here that shows you what it does.