Thanks Mark. Good post. I am pinging our good friend Forest Keeper because he and I have been touching on this subject. It seems that the modern-day Calvinsits have forgotten that prayer means petition and is distinct from, yet inclusive in worship, and also that even Calvinsits at some point expressed belief in the free will of man, both of which are currently denied.
Petition is one aspect of prayer, but is not the sum total as the above misleading comments tries to imply.