version: iPrint Client 3.12 with Silent Install option

I have two problems:

1) I setup a few test workstation packages, now when I associate a
particular printer(s) to that workstation, they pull down fine, when I
remove them from the iPrint policy, they stay on the workstation. Is there
a way to remove the printer from the workstation like with NDPS?

2) do you need NDPS installed on the client to get iPrint printers to come
down, or do you just need the iPrint client?