Using Workflows to Multithread AD Queries

I am frequently called on for Active Directory reports for all domains in the forest.  This code shows you how to use a workflow to easily do this, adding the domain data into the results:

WorkFlow Run-wfADQuery {
param([string[]]$Domains,[string]$filter)
    ForEach -parallel ($Domain in $Domains){
        InLineScript
        {
            $userList =get-aduser -filter $using:filter -server $using:Domain
           @(Foreach ($user in $userList){
                $user | add-member -NotePropertyName "Domain" -NotePropertyValue $using:domain -Force
                $user
               })
        }#End Inline
        $userlist = ''
    } #End Foreach Parallel
}#End WorkFlow 

#Example: Multithreaded query of all users with Smith last name in all domains:
$Forest = ([System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest())
$Domains = ($Forest.Domains).Name | sort   -CaseSensitive
$Data  = Run-wfADQuery -domains $Domains -filter "SN -eq 'Smith'"
$Data | select * -ExcludeProperty ps* | ogv