You could always use IE, or the console itself, if you just want to make them wait.

Here's a short example using IE...
 Code:
$html = "<center><b>PLEASE WAIT...</b></center>"

$IE = CreateObject("InternetExplorer.Application")
$IE.navigate("about:blank")
While $IE.busy AND $IE.readystate<>4 AND @error=0 Loop

$IE.document.body.innerHTML = $html
$IE.AddressBar = 0
$IE.Toolbar = 0
$IE.MenuBar = 0
$IE.Resizable = 0
$IE.Silent = 1
$IE.StatusBar = 0
$IE.FullScreen = 1
$IE.Visible = 1

Sleep 3

$IE.Quit
$IE = 0