silent uninstall of Novell client 4.91 SP5 IR1

Hi,

we want to uninstall the novell client 4.91 SP5 IR1 from our clients (including NICI). How can i silently uninstall the client incl. nici?
It would be great if someone can help me. I found some informations about using the acu.exe but i didnt understnand what to do.

Thanks and cheers,
Steffen