using type 4 driver inside SPJ

[Eric Owhadi]

Hi Trafodioneers,
I am investigating using type 4 driver instead of type 2 inside SPJ for a very 
specific need.
Problem is that I would not want to manage user name/password.
I see that trafci already behave the way I want, so when invoked from within 
one of the node of the cluster, it does not ask for user name and password, and 
still goes via mxoservers.
Is there any magic connection string to the type 4 driver that would trigger 
this desired behavior?
Thanks in advance for the help,
Eric