You can get checks from them to send off to your loan company. I imagine the APR is much higher on your Discover than on your loan so be careful. Sometimes (usually? Idk. Read the terms) when you balance transfer during a 0% promo, if you don't pay it off by the end of the promo they tack on the interest from the whole promo period!
QuickSilver - $20,000 | Amex ED $12,000 | Commence $5,000 | IT $2,200 | Freedom $2,000