SSO and quato

Hi,

I am running Tru64 5.1b with ASU. It is a member server in a windows 2000 
domain.
I want to start using quota's, but since there are no 'unix users' this is 
not possible.
Is it possible if I install Single Sign On? Like this ASU uses the windows 
active directory, but can also the quota manager do this?
Or is there another solution (expect making asu a domain controller)

Peter Jakobs