Nebula is Nreal's proprietary virtual workspace. DeX is a feature offered on many mid-to-high-end Samsung phones where you can plug it into an external monitor,

Nebula is Nreal's proprietary virtual workspace. DeX is a feature offered on many mid-to-high-end Samsung phones where you can plug it into an external monitor, mouse, and keyboard and get an Android-based desktop-style experience with draggable, resizable windows.