HumidBeing... tackling the thread all by your lonesome...
OP: yes, you submit your AMCAS, then schools will either screen your application and send you a secondary or they will automatically send you one. If they screen your application and do not select you to receive a secondary, you are rejected before the secondary (hence, pre-secondary). Otherwise, you send in the secondary and a fat 75-100 dollar check and you hope for an interview invite.