Let's see... (Run-On Sentence Alert!)
If they can get WebOS to boot up QUICKLY when the PC is turned on (leveraging that quickboot stuff they bought?), then the user is immediately presented with certain key apps available on the screen (OpenOffice/Music/Web/etc), able to be used from the get-go, with one of the apps being Windows (and that one takes a while to launch/boot), they may be convinced that WebOS is pretty cool, since it was available for use immediately, unlike Windows. They'd be forced to use it, and see how handy it is.
That would require the PC to boot into WebOS, running Windows in a Card.
Another option is to boot into Windows, running WebOS as a program in a Window. That option would get little use from those not already into WebOS, they'd never run the program. If it ran automatically they'd see it as bloat. I prefer the first option.
Now, Leo... Please put it on your HP Slate 500, or a newer version, the 501?