Poll a list of Windows Terminal Servers for a specific User (Multithreading attempt 1)

pollTerminalServers.ps1

function Get-XTSSession() {
	Param ([Parameter(Mandatory=$true, Position=0, ValueFromPipeline=$true, HelpMessage="UserName?")]
    $User )
	
	$aco_servers = "C:\Users\adm-ml\Documents\WindowsPowerShell\Modules\PSTerminalServices\aco-terminal-servers.txt"
	$workingDirectory = (get-location)
	
	if ($user.gettype().fullname -eq "System.String") {
		if ($user -ne $null -and $user.length -gt 0)  {
			$username = $user
		} else {
			write "Param $user is $null or empty."
			return
		}
	} elseif ($user.getType().fullname -eq "Microsoft.ActiveDirectory.Management.ADUser") {
		if ($user.samaccountname -ne $null -and $user.samaccountname.length -gt 0) {
			$username = $user.samaccountname
		} else {
			write "$user.samaccountname is not a valid username."
			return
		}
	} else {
		write "This function can not handle Type " $user.getType().fullname
		return
	}

	if (test-path $aco_servers) {
		Get-Content $aco_servers | %{
			# Define what each job does
			[ScriptBlock]$initScript = [ScriptBlock]::Create("set-location " + $workingDirectory + "; Import-Module PSTerminalServices;")
			[ScriptBlock]$Scriptblock = {
				param([String]$username,[String]$server) 
				get-tssession -ComputerName $server -State active -Username $username
			}
			
			# Execute the jobs in parallel
			Start-Job -name $_ -InitializationScript $initScript -ScriptBlock $Scriptblock -ArgumentList $username,$_ | out-null
		}
		
		# wait for jobs to complete
		wait-job -state running|out-null

		# Retrieve the information from the completed jobs
		$sessions = @()
		Get-Job -state completed|?{$_.hasmoredata -eq $true -and $_.name -match '^(rd-ts-)[0-9]{3}$'} |%{$sessions += (receive-job $_); Add-Member -InputObject $sessions[$sessions.count-1] -MemberType NoteProperty -Name Servername -Value $_.name}
		
		# clear all completed jobs
		get-job -state completed|remove-job

		# return results
		return $sessions
	} else {
		write "The Path '" $aco_servers "' is not valid."
		return
	}
	Exit 1
}