Well, CBT seemed to work see message#833085

btw, I've uploaded the callback - including source - yesterday, and I have included your remarks

We'll have to wait until the ut processes the request
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>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