In fact I need to know a reference for any control in another application but, following the next rules:

- difference from handle number. Because he always change
- I tried to use sendmessage API or WM_GETTEXT.
This works for VB and common controls. But for unknown controls or user control don't. This functions always back empty result.

There is another way or another API function to get reference for unknown object or user control ?
Tkx for any help