Label printing works on linux but not windows

Hello, I currently have a php inventory program running on a nitix server (linux) but I'm trying to move it all over to a windows 7 pro machine running wamp. I got pretty everything else to work fine but for the label printing. I have already enabled lpr. This works on linux:

function label_print($label)

{

	$Printer = ics_select('Employee, Printer', 'Address',

		"EmployeeId=$_SESSION[ICS_UserId] and LabelPrinter=PrinterId");

	$pipe = popen("rlpr -H$Printer[Address]", "w");

	fwrite($pipe, $label);

	pclose($pipe);

}

How do I get this to work on windows or is it not possible and if so, what are my options?

Thanks!

Dan