Hi, first question .. why you want to manage the IRQ7 under win? you must use windows api to manage lpt port.
A callback is a pointer to function that a background process invoke for an event (user input, system event.. or other). The managed & unmanaged code refer to .NET programs, not for standard program. I'm not sure, but I think that is not possible to invoke a VB procedure from a callback.. See an example of threading in Visual Basic. cod [Non-text portions of this message have been removed]
