If you are a GN3 user, here are links to learn about differences between GN3 and GN4:

Differences with GN3

•GN4 applications vs. GN3 applications

•Differences with GN3 Shell

•Differences with GN3 Ted

•Differences with GN3 Fred

•Differences with GN3 Edt

•Differences with GN3 Tracy

•Differences with GN3 LogAdm

•GNPortal vs. WebShell

•Under the hood