Step: 6
   Glucose makes two molecules of glyceraldehyde 3-
              phosphate, which are oxidized at step 6.
   The aldehyde hydrogen is transferred to NAD+
              making NADH.
   A new high-energy anhydride linkage to phosphate
              is formed.
 

Step: 7 & later step 10
   The high energy phospho-anhydride donates its
              P to ADP making ATP by substrate level
              phosphorylation.