I used the code they posted in the API in RenderingOptions "each" method here: http://code.google.com/apis/sketchup/docs/ourdoc/renderingoptions.html#each_key But the example puts each key into a messagebox, so I changed "UI.messagebox" to "puts" so it would send it to the Ruby Console. The code looks like this: model = Sketchup.active_model renderingoptions = model.rendering_options renderingoptions.each_key { | key | puts key } and I run it in Jim's Web Concolse, which is my favorite Ruby development tool. Then I just went through the returned keys one by one and compared then to the API. There were quite a few missing ones in the API, and some in the API that don't actually exist. Chris

TIG- I am on a PC though trying to do a similar thing for the mac. I'll try some observer fun but am sure to be splatted into oblivion Thanks for your thoughts. best, Justin