Unlike other skins it doesn’t scale, it resizes the UI when you resize it. It has no skin decorations except for a small bar at the bottom that indicates the current resolution. You can use this to simulate resizing from the user.
We’ve been moving slowly to improve Codename Ones desktop support. Our own tools are already mostly written using Codename One (GUI builder, Settings).
We already feel that using Codename One in a desktop setting can produce a decent result in the right hands and we know a few people do exactly that. However, it’s hard for us to gauge expectations and desires from customers without feedback. When we build our own apps we use a lot of tricks we never bother to publish as our use cases are usually edge cases.
If you are looking to build desktop and web apps using Codename One let us know and we can discuss features that would make it better suited for those use cases.