JCo Connections for ess/mss in ep 7.3

Hi Experts,

We are configuaring ESS/MSS  in ep 7.3 with ECC 6.0 EHP6 as backend.

So we are implementing Business Packages for webdynpro ABAP.

I doubt whether we need to create any JCOs for webdynpro ABAP ESS/MSS...Please confirm

If yes Please let me know the JCOs which needs to configured

Regards,

Kumar