Keyword searches?

Hi folks,

I have a few questions regarding the keyword function of RT.  I'm very 

happy with everything else RT does, but i’m curious as to why I can’t
search on keywords the way I would expect. Essentially, what I would most
like to do is search on multiple keywords (if I can select multiple
keywords, i’d like to be able to search and select on those), and I’m
curious as to why I can’t search on queue-specific keywords (ones that
aren’t allowed to be selected globally). If I can’t search in a
queue-specific fashion, is there any real reason to have keywords on the queue?

Can someone provide me a more detailed working example of the use of 

keywords? I’ve combed the helgrim rtdocs and the mailing lists to no real