Lex Rex said:
What does the term Calvinian(ism) mean, in contrast to Calvin(ism)?
They are identical terms; a rose is a rose is a rose.

What is Reformed Covenant Theology, roughly? I can't get it clear? Do you simply mean covenant of works/ covenant of grace distinctions? What of the historic covenants - are they discussed under such a topic?
Simply put.. there is one "covenant of grace" where by God calls the elect to salvation through faith in Christ throughout history; from Adam to the last man. The "historic covenants" are God's progression of revelation concerning the redemption which is in Christ. I grant you that this is a VERY simplistic answer. However, if you have further questions in regard to Covenant Theology, please start a new thread.
Explain to an Australian the term OPC. "O" Presbyterian Church, presumably. What are her basic distinctives, briefly?
OPC = "Orthodox Presbyterian Church" (denomination) See here:
OPC Homepage.
Where exactly does Augustine mention Forensic Justification? I have read scholars who contend that Luther was the first to argue this way, eg Alistair McGrath, but he is a bit New Perspective (your faith is your actual righteousness, or obedience to the covenant, not Christ's alien righteousness received by faith, for righteousness is not imputed according to Alistair, although guilt is), so I am a touch scared of him.
Another good topic for a new thread.

Was Calvin really Catholic on the Trinity? Reading BB Warfield and Institutes I, I thought he contended that the Son was Autotheos, which is hardly a position endemic to historical Christendom. (I think I agree with him).
I'm not sure what you are asking here.

And how are you using the term "Autotheos"? Please start a new thread for this one too.

Finally, on protocol, is it decorous, in [a] for[um] a such as this, to ask questions on someone else's thread?
You betcha! The forums are for open discussion and everyone is welcome to participate. If someone wants to keep something private, they can send a PM (Private Message) to the particular member.
What we do request and try to enforce in a consistent and fair manner is keeping threads on topic.
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In His Grace,