WindowsLiveLogin::setAppId

function setAppId($appid)
{
	$_force_delauth_nonprovisioned = $this->_force_delauth_nonprovisioned;
	if (!$appid) {
		if ($_force_delauth_nonprovisioned) {
			return;
		}
		$this->fatal('Error: setAppId: Null application ID.');
	}
	if (!preg_match('/^w+$/', $appid)) {
		$this->fatal("Error: setAppId: Application ID must be alpha-numeric: $appid");
	}
	$this->_appid = $appid;
}