widget - blogs - search

Hi

I've installed the Global site search and the Post indexer in my wordpressmu.
I wan to use this plugin in another blog, not in the main one. I want to do a search of posts publish in the other blogs , again not in the main one. How can I do this ? Thanks.

Also in the Pluglin section , I don't have this plugin. Is there a way i can have it in a widget?