To browse at the content of a dst-File, you can use the dst-explorer

SetupBender
dst-explorer your.dst 

At the start of the dst-exploerer a short help gets printed. You find it below for reference.

   1) exploring (r,s,m,fm)DSTs:

       >>> ls('/Event')
       >>> ls('/Event/Charm')
       >>> ls('/Event/Charm/Phys')
       >>> ls('/Event/Charm/Phys/D2KKK')

    2) getting particles from TES and loop over them :
 
       >>> Ds = get('/Event/Charm/Phys/D2KKK')
       >>> for D in Ds : print D.decay()

    3) go to the next event:

       >>> run(1)
       >>> ls('/Event')

    4) loop over events in search for ``valid'' data

       >>> Ds, evt = seekForData('/Event/Charm/Phys/DstarForPromptCharm/Particles' )

    5) loop in search for event with certain Stripping Decision:

       >>> ok, evt = seekStripDecision('.*Lam.*' )