Hi everybody, To give you an idea, take a look at this simple example of a message box using DllCall function. $result = DllCall("user32.dll", "int", "MessageBox", "hwnd", 0, "str", "Some text", "str", "Some title", "int", 0) The question is how to check if DllCall will work before the message box appear? Thanks & any help would be greatly appreciated..