Looking for some software

I borrowed some surveillance cameras and equipment from someone and now have surveillance video. However currently when watching it on the screen it shows all 4 channels. I am looking for the name and/or where to get the software so that I can split the channels and only watch one camera channel/feed at a time. When I borrowed the surveillance equipment they didnt give me the program to split them to watch them one at a time. They do not know where their own software is for this. I currently have the footage saved to 2 different DVD disks. Can anyone help with this? :confused