Using NW6.5sp2 / Client 4.9sp1a

We can successfully roll out NDPS printers to workstations if they are
associated with the user container or user groups, using RPM in iManager.
However, when we try the same procedure using a Workstation Group instead
of a User Group then nothing happens. Does NW6.5 RPM support workstation
groups? If it does, any ideas on where we may have the problem?