You have to download a program. Audio Hijack Pro works really well. It gets fuzzy after 10 minutes of recording if you only have the demo, but you can save the first file to your desktop, delete it on the program, and then start recording the next bit.
"I mean, sitting side by side with another man watching Patti LuPone play Rose in GYPSY on Broadway is essentially the equivalent of having hardcore sex." -Wanna Be A Foster.
"Say 'Goody.' Say 'Bubbi.'" ... "That's it. Exactly as if it were 'Goody.' Now I know you're gonna sing 'Goody' this time, but nevertheless..."