You'l need a client on the desktop side, the unix print service is built into NT (maybe need to be installed seperately), or you can use Exceed 95 which have support for UNIX printing.
The IP of the remote host cannot change, the printer name on the remote host have to be used on AIX exactly as on the remote host (so change it to a short word, in lower case).
All printers can have the same name on remote host, but need to be different on AIX side.
If this is not clear let me know.
Hope it helps