This makes me think that I should just place limit orders for every S+P 500 company at $.10. Chances are the orders will never be filled but if this happens again I'll get rich.
GTC (good 'til canceled) are available to me (nobody special--just a margin account at Zecco) as nothing more than an option to change on a normal order. The only difference is that they stay open across the end of the day. (Supposedly they'll be canceled by something after 30-90 days if I don't cancel them and they don't execute.)