Wet Proofs

Hello All: I am asking for info on "Wet Proofs". I know that in Asia they are produced on hand presses using plates (not the same plates that will be run on press) and use standard inks and the actual paper your job will be run on. How accurate are these proofs to a specific print specification (Ex: Fogra 47)? Is there an easy way to tell a Wet Proof from a press sheet? I'm guessing that if the stock adheres to the print specification then there is a chance that the Wet Proof could as well. I suppose we could ask for an IT8 or control strip to read and analyse from the Wet proof. How are Wet Proofs actually made? The definition of a Wet Proof changes depending on the article you read. Any thoughts? Thanks Mike Stewart