User PowerShell to Send a Pop-up

Nothing magical here, just a little something to help get the attention of whoever is at the keyboard on a remote machine. This function will allow you to pop up a message on a LAN-connected computer.

function Send-Popup {    param ($Computername,$Message)
    if (Test-Connection -ComputerName $Computername -Count 1 -Quiet){
        Invoke-Command -ComputerName $Computername -ScriptBlock { param ($m) msg * $m } -ArgumentList $Message
        Write-Host "Message sent!"
    } else {
        Write-Host "Computer not online"
    }
}