How would i play a D7sus open? and also Dsus open?

other chords in the song are G, D/G, G/B, Em, D/E.
and with the slash chords how do i know where to add the slash at??
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Last edited by victoryaloy at Mar 7, 2007,

 Dsus   G    D/G   G/B    E-   D/E


These are my favourite open voicings for those chords. D7sus = D7sus4 = Dsus by the way. Dsus is shorthand for D7sus4, as is D7sus.