[ddouglass]

First let me say that MTU does not condone using any disks or downloaded files that are not legal. In other words if you are using discs with copies from other people or files downloaded from sites that do not have a license to sell from the producers those are illegal.
For those discs from the producers like Sound Choice or Chartbuster and many others. Most of us use the ID number on those discs with the initials of the company in front such as SCxxxxx for Sound Choice. You will find many of them already loaded in Hoster's database where all you have to do is select the Brand and DiskID from dropdown lists and the information will fill in automatically.
As No Vocals said Hoster is the program you use for shows. Microstudio is mainly for home use and to be able to burn backup copies or custom discs for you to take to other peoples shows. The rest of the suite is for permanent Key Change, Removing Vocals from regular Audio songs, and Creating your own Karaoke song files wwith the words. A lot of this will require working with it a while to figure out how it works and the best way for you to use it.