Hi - I've read the sticky topics and am aware that asking about posts is touchy - I understand why, I've been in the software biz for many years. So, I want to start my first forum post by saying that I'm not posting to "get a post". I am interested in learning how to modify a post. I'm taking a mastercam class at the local college - prior to this, I've mostly hand coded. As the class progresses, I'd like to be able to leverage my mcam lab access to do a couple of small projects on my home mill. I have a post that's close for my control, but I need to make some modifications. Rather than ask for how to make specific mods, I'd rather further my education, learn about mcam posts, and then figure out what I need/want to change. Therefore, my question is: Where I can find documentation about how the MCam posts are structured etc.? I've found the document that lists the post parameters. What I'd like is an intro/overview re how mcam posts are structured. A formal description of the post language syntax would also be handy. I'd also find it informative to read a doc on the architecture of what's in machine vs control defs. For what I'm looking for, I'm guessing the mcam version doesn't matter a lot; I have both X and X2 avail in the class (I think the lab has X2 MR1 installed but not MR2). Thanks in advance for any pointers to relevant docs, Dave