In previous WC and SC games, there was a login screen where several characters could be created so various family members could play through the campaign on their own. Also, in battle.net, our two players are at vastly different skill levels and if one earns the Diamond league the other player would like to play at the Bronze level deserved, and have more fun. The Play As Guest option is an interesting option, but doesn't allow multiplayer and really isn't the right solution for a multiple-player household.
I'm not finding a way to do this with SC2, as with WC3 and SC. Is there any such functionality? There really needs to be a way to do this. What's the alternative? Buy another key and uninstall the app every time someone else wants to play?