string s = "start";
object rv = exec.Informplugin ("GP screen_ATC_V2.1.dll", (object)s);

if (rv is string)
{
	string a = rv as string;
	if (a!= "error")
	{
	exec.Setcurrenttool(Convert.ToInt32(rv));
	}
	else
	{
	MessageBox.Show ("Errore !!!");
	}
}


