MercatorWebService40.MercatorWebServiceSoapClient client = new MercatorWebService40.MercatorWebServiceSoapClient();
MercatorWebService40.SecurityInfo si = new MercatorWebService40.SecurityInfo();
si.SecureKey = ... ;

MessageBox.Show("SqlServer = " + client.GlobalsSqlServer(si));

MessageBox.Show("RepData = " + client.GlobalsRepData(si));

MercatorWebService40.StringMws s = client.GlobalsParams(si, "LANGUE_DEF");
if (!string.IsNullOrEmpty(s.LastError))
    MessageBox.Show("GlobalsParams : " + s.LastError);
else
    MessageBox.Show("LANGUE_DEF = " + s.Value);