The script's idea is very simple. It collects all the XDCC triggers and packs, and lists them for you, so you can search through them and choose what you want to download. All the nick names are list in one column, and after you choose a nick, you get all his packs listed in a second column. Then you just need to double click on a pack to request it.
And of course there's also a search option so you can search for a file in all hundreds of packs that are usually stored.
Besides that the script also saves any file you request, so you can request and resume downloading it later on. After the files are listed, you can request and resume all the files (no matter how many different networks they are in) by a press of a button.