Hmm, if I'm getting your question right, then what you do is this: Fret two adjacent strings so that one is either a half or a whole tone lower than the other, depending on the feel you want to achieve (and the reach of your fingers). Play them both, and then bend the lower string up to the same pitch as the higher one.
Pitch, yeah... Bend the one that's lower in pitch up to the pitch of the one that's higher in pitch...