HOW do you tell KSH is interactive ?

[Jun Lu]

In my .profile I set "export ENV=~/.kshrc".  Certainly I don't want
the aliases or something to executed for non-interactive shell, i.e.
the shell spawned to interprete the ksh-scripts.  Is there a way to 
tell if the shell is interactive wone ithin .kshrc ?

Thanks,
--Jun
P.S. testing PS1 didn't work.  
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