Hi Bela,
>I do not know the sure answer, because the caller app usuallay in a wait state (user sits and see the form, nothing else). So, I have never met this issue.
Perhaps time to whip up a demo <g>
>I suspect that it works like an active-x event. There is a sys setting for these events to occur asyncronously.
Could you elaborate a bit ? I've found 2366 (critical section) - did you mean this or did you have another in mind ?

rgds

thomas