How to check who is the user account that currently logged on the domain workstation?

# Applies to: Computers
#
# Description: This script searches for a specific, logged on user on all or 
# specific Computers by checking the process "explorer.exe" and its owner.
#
# ********************************************************************************

#Set variables
$progress = 0

#Get Admin Credentials
Function Get-Login {
Clear-Host
Write-Host "Please provide admin credentials (for example DOMAIN\admin.user and your password)"
$Global:Credential = Get-Credential
}
Get-Login

#Get Username to search for
Function Get-Username {
      Clear-Host
      $Global:Username = Read-Host "Enter username you want to search for"
      if ($Username -eq $null){
            Write-Host "Username cannot be blank, please re-enter username!"
            Get-Username
      }
      $UserCheck = Get-ADUser $Username
      if ($UserCheck -eq $null){
            Write-Host "Invalid username, please verify this is the logon id for the account!"
            Get-Username
      }
}
Get-Username

#Get Computername Prefix for large environments
Function Get-Prefix {
      Clear-Host
      $Global:Prefix = Read-Host "Enter a prefix of Computernames to search on (CXX*) use * as a wildcard or enter * to search on all computers"
      Clear-Host
}
Get-Prefix

#Start search
$computers = Get-ADComputer -Filter {Enabled -eq 'true' -and SamAccountName -like $Prefix}
$CompCount = $Computers.Count
Write-Host "Searching for $Username on $Prefix on $CompCount Computers`n"

#Start main foreach loop, search processes on all computers
foreach ($comp in $computers){
      $Computer = $comp.Name
      $Reply = $null
        $Reply = test-connection $Computer -count 1 -quiet
        if($Reply -eq 'True'){
            if($Computer -eq $env:COMPUTERNAME){
                  #Get explorer.exe processes without credentials parameter if the query is executed on the localhost
                  $proc = gwmi win32_process -ErrorAction SilentlyContinue -computer $Computer -Filter "Name = 'explorer.exe'"
            }
            else{
                  #Get explorer.exe processes with credentials for remote hosts
                  $proc = gwmi win32_process -ErrorAction SilentlyContinue -Credential $Credential -computer $Computer -Filter "Name = 'explorer.exe'"
            }                  
                  #If $proc is empty return msg else search collection of processes for username
            if([string]::IsNullOrEmpty($proc)){
                  write-host "Failed to check $Computer!"
            }
            else{      
                  $progress++                  
                  ForEach ($p in $proc) {                        
                        $temp = ($p.GetOwner()).User
                        Write-Progress -activity "Working..." -status "Status: $progress of $CompCount Computers checked" -PercentComplete (($progress/$Computers.Count)*100)
                        if ($temp -eq $Username){
                        write-host "$Username is logged on $Computer"
                        }
                  }
            }      
      }
}
write-host "Search done!"

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