The syntax of the command is: adprep option Supported : /forestPrep Update forest information Must be run on the schema role ...

The syntax of the command is:  adprep  [option]  Supported : /forestPrep             Update forest information                         Must be run on the schema role master  /domainPrep             Update domain information                         Must be run on the infrastructure role master                         Must be run after /forestPrep is finished  /domainprep /gpprep     Update permissions on Group Policy Objects in                         Active Directory Domain Services and SYSVOL                         Must be run on the infrastructure role master                         Must be run after /forestPrep is finished  /rodcPrep               Update permissions on NDNC partitions to                          enable replication for Read-only Domain Controllers.                          Runs remotely and contacts a NDNC replica to update                          permissions. Must be run after /forestPrep is                          finished. Can be re-run at any time. You should run                          this in particular when you have DNS application                         partitions in your forest.   Supported [option]:  /noSPWarning            adprep will suppress the Windows 2000 service                          pack 4 requirement warning during /forestprep  /wssg                   Return wssg-specific error codes  /silent                 adprep will suppress all output. May only be used                         with /wssg.