>I am working on a timer solution. I have found that VFP timer control doesnot get event during long statements like SQL select,
>and user actions (mousebutton down on window title etc.)
>I wrote an fll, in which I use the NullEvent to check the elapsed time, and if an interval is over it fires a UDF. (Time resolution 1 sec) It works under normal VFP statements like SQL select (so it is good for animated thermobar bmp-s, which has no affects for the select performance - max 4 percent slower). But ...
>VFP NullEvents doesnot come under some user actions. So, if user push down the mouse button my timer event isnot fired.

In Windows, no matter what we'll do, we'll never be able to rely on something that will never miss one event. This is just the way Windows is.

Many factors can affect that. Here, you have SQL. It can also be another application doing an intensive process or just to start another application.

However, what you plan to do might help a little bit, however it will not work 100%.