Hi, I just tried a very simple program: ===================================== Sub Globals 'Declare the global variables here. End Sub Sub App_Start 'Form1.Show Serial.New1 End Sub ===================================== Unfortunately, when I try to compile... it pops-up an Error message: " Error compiling program. Error description: serial is not a known control or object. Occured on line: 8. Serial.New1" Any idea why this happens ?