How about the activate property. First you can check to see if it is opened,
then when you activate it, it would come to the top.

frm.Activate();

If you mean you want to know if any part of the form is visible in the sense
that it isn't being covered up by other applicatons, I believe this is not a
simple problem. After all, a single pixel of your form being visible
violates the condition! How do you deal with translucentcy of other forms?
If it is 'almost' opaque (say, alpha = 255-1) is what's underneath
'visible'?

I think you would need to find all applications running, get their forms
(some may have more than one), find their locations and size, check for
translucentcy, compare against the dimensions and locations of your form,
and your form if visible if it meets all the above conditions...

Not sure what you need this for, but that's my 2 cents...

[==P==]

I'm looking for something like a windows message or notification, for example
a message received through WndProc.

Thanks.