Hello, I hope to soon get Apprentice for my Mac and use it for my film company. I just had a quick question, is the window layout for Apprentice, Apprentice HD, Houdini Escape, and Houdini Master all the same? The reason I ask is Houdini will be my first 3D program I've ever used, so I just don't want to be surprised when I switch between Apprentice and Escape.

They all use the same desktops (window layouts), and if you design a custom desktop, it is interchangeable as well. Escape simply doesn't allow you to edit OPs that it does not support. The rest of the dialogs are the same too.