Samba as a PDC?

Hi all! Lately, I am reading some samba related messages claiming that samba can act as a Primary Domain Controller in a mixed network environment (with NT and Linux boxes running in the same network). I used to think that samba only emulates single features of the SMB environments such as sharing some folder or printer. But act as a PDC is much more than this... Could anybody confirm that samba can as a full featured PDC? Regards, Jose L. Rojano