It seems the conclusion is that Intel provides this technology in a VERY difficult way.
I have a Fujitsu U772, which several reviews say coem with WiDi capability, yet there is no pre-installed software for it, Intel WiDi instllation says "OEM modified the drivers" and will not install, while Fujitsu support responds with a big "Huh?", asking me to provide THEM with pointers to the relevant documentation (sheesh!).
I wish I had known the crappy state of this technology before I bought an HDMI-WiDi adapter to try it out.