You don't even have to start DPP. Just start AfterDPP and it will start DPP automatically for you.
You can have access to AfterDPP extensions through the Batch process window of DPP (CTRL-B) :

As you can see, After DPP adds 2 new buttons to this window :
- AfterDPP Button : allows to start DPP conversion of the selected files followed immediately by AfterDPP post-processing. If you clic on this button you don't need to clic on the DPP Execute button. AfterDPP will invoke DPP to convert the selected files and then will apply the post-processing functions to the converted files.
A clic on this button will open the AfterDPP Batch Window. - Options Button : this button allows to configure the post-processing functions that will be applied to the selected files.
A clic on this button will open the AfterDPP Options window
