RTIR and RT speration

Hi,

            I'm looking at using RTIR as we want an incident

response system. We have been using RT for the past few years for
customer support, internal support and development work tracking. Will
all these queues remain as they are if I also install RTIR, or will it
change a lot of the existing RT functionality?

I want to keep everything as it is for the existing queues and retain
all the existing functionality, so how best would I do this?

Thanks.