PC anzeigen, an dem ein User im Moment eingeloggt ist

Function Get-Username {
$Global:Username = Read-Host "Gebe Benutzernamen ein"  
if ($Username -eq $null){
	Write-Host "Benutzername darf nicht leer sein!"  
	Get-Username}
$UserCheck = Get-ADUser -Filter {'Name -like "*$Username*"'} -SearchBase "OU=ABC,OU=DEF,DC=GHI,DC=JKL"  
if ($UserCheck -eq $null){
	Write-Host "Ungueltiger Benutzername. Bitte ueberpruefen!"  
	Get-Username}
}
get-username
$computers = Get-ADComputer | where {$_.accountisdisabled -eq $false}
foreach ($comp in $computers)
	{
	$Computer = $comp.Name
	$ping = new-object System.Net.NetworkInformation.Ping
  	$Reply = $null
  	$Reply = $ping.send($Computer)
  	if($Reply.status -like 'Success'){  
		#Get explorer.exe processes
		$proc = gwmi win32_process -computer $Computer -Filter "Name = 'explorer.exe'"  
		#Search collection of processes for username
		ForEach ($p in $proc) {
	    	$temp = ($p.GetOwner()).User
	  		if ($temp -eq $Username){
			write-host "$Username is logged on $Computer"  
		}}}}