BG process

[JD Smith]

Why does this not work (Emacs 22.3.1):

  (start-process-shell-command "TEST" nil "/bin/echo TEST > /tmp/test  
&")

(note the ampersand).  It seems that since the process is backgrounded  
in the shell, Emacs sees the command return quickly, gives up on it  
and kills it off before it can complete its work.  How does one  
arrange for a backgrounded process in a shell invoked by Emacs to run  
through unmolested?

Thanks,

JD