System.DirectoryServices.ActiveDirectory Namespace

[ActiveDirectory.Forest]
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().Name
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().ApplicationPartitions
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().Sites
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().GlobalCatalogs
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().Domains
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().ForestMode
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().RootDomain
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().Schema
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().SchemaRoleOwner
[System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().NamingRoleOwner

[Active Directory Domain]:


GetCurrentDomain() can be switch with GetComputerDomain()
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().InfrastructureRoleOwner
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().PdcRoleOwner
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().RidRoleOwner
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().DomainControllers
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().DomainMode
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().Parent
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().DomainMode
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().Children
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().Forest
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().Name

[Computer Specific]:
[System.DirectoryServices.ActiveDirectory.ActiveDirectorySite]::GetComputerSite()
[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().Name
[System.DirectoryServices.ActiveDirectory.Domain]::GetComputerDomain().Name