Yes.
No.
LiteSTEP is a shell, just as Explorer.exe is the 'default' shell....it is the interface between the user and the OS kernel.
Desktop, icons, taskbar, clock, start menu....all of that can be totally replaced....hotspots, virtual desktops, animations, links/shortcuts....it's all that makes up the actual GUI - Graphic User Interface......that which separates Windows from Dos command lines....
There is no better advice.