I created discrete power codes for the "fat" PS3 using my home automation controller (MCV), a network based ir blaster (SQ Blaster), and a Logitech PS3 adapter... the same could probably be done with an S70, a Logitech, and a home theater PC.

What I did was write power on and power off scripts that first ping the PS3 on the network. If I hit power off, it pings the PS3 and if it responds, we know it's on, so run the Power Off IR sequence. If it doesn't, we do nothing. Similarly, if I hit Power On, it pings the PS3 first and confirms it doesn't respond before sending the IR code.

I wonder if you can do somthing similar on the S70 through the ip support in widgets. Never tried.