I have seen a lot of modules that have been ported from OSC to Zen Cart, and I was wondering where to actually start.

What are the main deifferences between OSC and Zen Cart for instance I know to replace tep_ with zen_

What would a simple guideline be for people that have a clue, but not the whole clue.

I have been working on porting a mod, but just can't quite get it right.

Any general assistance would be appreciated from those people who have done this sort of thing before.