No, it does not come with Forgotten Realms information as that is WotC
No, you cannot purchase the data sets from CMP. WotC did not renew their
license to sell them last November 2006.
Yes, you can create you own races or modify existing ones. Ask for help
in PCGenListFileHelp group on Yahoo.
> Does PCGen come with all info related to D&D/Forgotten Realms (aka
> races, classes, prestige classes, feats, equipment, spells, and such)?
> Or do we have to purchase data sets from Code Monkey publishing? Also,
> can we make our own races using PC Gen or modify existing races?