Exactly my thoughts - or sitting at a READ EVENTS might be appropriate. This may very well be the problems Christof referred to in the Wiki topic - inappropriate use of the capability. I think it should be used with extreme care...

>Jim,
>
>The callback was originally intended to be used when vfp was doing a call to a dll (eg CopyFileEx(), EnumResourceTypes(), ...)
>Under those circumstances, vfp wouldn't do anything but waiting for the dll function to return and I estimated that this would be reasonably safe.
>
>I think that anyone using it will discover the limits if he/she goes beyond that
>
>Thanks