——————PDC Emulator——————-
//Change PDC Emulator
Active directory users and computer -> Change Domain controller -> Operations master -> PDC
communicates with pre NT 4.0 domain machines
[1]. Act as the central time sync authority within an AD forest (this only applies to the PDC FSMO in the forest root AD domain)
[2] Any password changes or account lockouts that occur on any DC are communicated to PDC securely.
[3] When your login attempted is failed because of incorrect password it will check the PDC for a new password
[4] Editing GPOs by default occur with the PDC FSMO
[5] When root scalability mode is not enabled (the default), DFS root servers get updates from the PDC FSMO. When root scalability is enabled, DFS root servers get updates from the closest DC instead
[6] The PDC FSMO is the only DC that applies the Password policy settings and the account lockout policy settings specified at domain level and writes the information to the domain NC
[7] If you have NT style applications that want/need to target the PDC, those apps will probably break as soon as the PDC is not available.