In some mail I received from matthew green, sie wrote
> 
>  
>    btw, 'exec tmpfile 4<>' gives me:
>    Syntax error: redirection unexpected
> 
> 
> yah, i discovered this the other day.  our shell has broken <> support.
> /bin/ksh works...

none of the ksh's I've found work, they all give this response:

$ exec tmpfile 4<>
ksh: syntax error: `newline' unexpected

(or similar)