What are the commands /nend and /nex in Netweaver used for?

/nex in the t-code entry field of the SAP tool bar. This terminates all separate sessions and logs off immediately (without warning!).

WARNING: the /nex command doesn’t ask if you’re sure or anything. It just bombs you out of the system, losing anything that wasn’t saved.

Alternatively, try: /nend command, this will at least politely warn you that continuing will lose any unsaved data. This terminates all separate sessions and logs off (corresponds to "System -> Log off").