csh - how to automatically kill background processes on logout

[Jan B. Andersen]

In Bourne shell background processes started with '&' will automatically
get killed on logout (hangup). But the man page for csh says: "Processes
running in the background (by &) are immune to to signals... including
hangups."

How do I enable SIGHUP? In .logout? Should I kill them instead?
-- 
Jan B. Andersen                              ("SIMULA does it with CLASS")