Thanks Christof. Now that suggests that there is some mechanism to 'inform' the desired callbacker to do so. Would it be a discrete 'function' or some option of the parameter list or???

Jim N

>Hi Jim,
>
>>Could one of you inform the poorly educated among us (that's me at least) of what a "callback is?? I would appreciate it.
>
>A callback means that Windows (or any other DLL) calls a function in your VFP application when something happens.
>
>Christof