Ping-Host Example

function Ping-Host {param (    [string ]$HostName,
                                          [int32] $Requests = 1)

      for ($i = 1; $i -le $Requests; $i ++) {
            $Result = Get-WmiObject -Class Win32_PingStatus -ComputerName . -Filter "Address=' $HostName'"
            Start-Sleep -Seconds 1
            if ($Result .StatusCode -ne 0) { return $FALSE }
      }
      return $TRUE
}