// Declare a BarTender application variable
BarTender.Application btApp;
// Create a new instance of BarTender
btApp = new BarTender.Application();
// Set the BarTender application visible
btApp.Visible = true;
// Return the maximum number of printers that
// can be connected to the BarTender Licensing Service
MessageBox.Show(btApp.LicenseServer.MaxAllowedPrinters.ToString());
// End the BarTender process
btApp.Quit(BarTender.BtSaveOptions.btDoNotSaveChanges);