Hi Fabio,
>My problem is different:
>VFP eliminates, automatically , one definition of the code category from the memory or not?

Best way to find out is probably one of the VFPT.

>But!, if, when the memory resources are to the limit, VFP eliminates a free definition of the class from the memory, then some problems exist.

You could try to influence at least part of the windows memory behaviour with API calls SetProcessWorkingSetSize and VirtualLock to guarantee stable resources from the OS level. Otherwise any time your app looses focus you are in danger of memory swapping action. But these API calls might slow other apps on the same machine down - or can you be certain that your app has "priority" on the system ?

HTH

thomas