In Vault TEC HQ, the second terminal is on the floor BELOW where the Masterbrain patrols.
Personaly, in my RP, Im going to help the slaves, and then in the future, send a team of BOS thier to set up a proper lab, and temporary military government to hep the ex-slaves clear the town, and set up.Eventualy, it will become a colony of the government the BOS sets up in the capital wasteland.(I dont have a gameing pc yet, but when I do, this is the kind of moding I hope to do.Hell, bethesda didnt give us an ending to all this yet, so Ill have to, at least untill the next FO comes out with some answers).