>where do put this?
>ln -s /dev/ttyS4 /dev/modem
>these two lines seem to work in .login
>suassword
>ln -s /dev/ttyS4 /dev/modem

opps, this seems like a mistake in that once a symbolic link is created it remains.

so, all you have to type is:

suassword
ln -s /dev/ttyS4 /dev/modem

no need to put it into your .login