This is the most suspect question i've ever heard! Anyway, your kids will be no doubt using Limewire. This is a peer-to-peer file sharing program ie: someone who wants an MP3 you have has a direct link to your hard drive, and likewise, your hard drive connects to other peoples to get an MP3 you want. My uncle's daughter uses this and I spent 3 hours untangling a horrible mess of spyware this had put on his hard drive, so watch out. Use a program called AdAware if you are using Limewire, and this should weed out any spyware/malware hidden in your files. Better still, remove Limewire....