Simple example for powershell

simpleexample.ps1

$req = (New-Object System.Net.WebClient)
$req.Headers.Add("Content-Type", "application/xml")
$req.UploadString("http://sms3.pswin.com/sms", "<?xml version=""1.0""?>
                <SESSION>
                    <CLIENT>myusername</CLIENT>
                    <PW>mypassword</PW>
                    <MSGLST>
                    <MSG>
                        <TEXT>Test message</TEXT>
                        <RCV>4799999999</RCV>
                    </MSG>
                    </MSGLST>
                </SESSION>"
        )