'inbox' would be : select * from Mails where read=false;
together in a folder. It doesn't delete them from more conventional heirachical file systems but provides another tool for helping you organise your data. Like the LifeStreams idea. Only less crap.
The user plays round with an application. Depending on which items of functionality (hence forth to be referred to as functions) they use the genes of that function get stronger and breed more. Essentially. There's more to it than that but it gets a bit involved and then I go crossed eyed.