Thanks to all for your speedy replies!Asking for the best software is like asking what is the best car? You're quite liable to get a whole range of answers. There are only 3 packages for this - FreeScan, ProScan and ARC-XT
I would start off with FreeScan, which is freeware, then move onto ProScan or ARC-XT at some later time if you need their capabilities. All the authors can be found here, and in fact ProScan has its own sticky thread for support.
This article gives you all the links you need...(all links are blue)
Uniden DMA Software Support - The RadioReference Wiki
and this article will get you started on how to understand how to program the DMA scanners, USB-serial cables and much more. Find your scanner at the bottom of this article and read the Easier to Read manual - don't bother with the Uniden mess...
Program your DMA Scanner - The RadioReference Wiki
Yes FREESCAN is free..but the owner Asks does accept donations .. but does not insist on it or demand it. Seems only fair to donate a few $$ to him if you like his program after you try it out.I use FreeScan for both my 996XT and 996T. It does everything I need it to and did I mention it's free?