I rarely buy stocks as I speculate using options but with that said, can someone please explain to me how the after-hours trading stocks work? I see I have access to it with my OptionsXpress account and I also see Yahoo posting after hours prices but am confused how it actually works... I just see 2 rows...One with a bid amount wanted and then one with ask wanted with amount available? Finally, If I was going to purchase shares in the after market say using OptionsXpress, is the commission structure different than buying shares during regular hours? Thanks.