Know when an app opens a document from its hwnd?

[wordracr]

Ok, what my program does it hide other programs from the taskbar and screen.

It's pretty cool so far. But in addition to restoring apps when the user manually
chooses, I would also like the app (not mine) to be visible when a document is
opened that uses the program that was hidden.

Hopefully I explained clearly enough, just let me
know if any clearification is needed.

[Megatron]

I think you might need to elabourate a little.

[wordracr]

Ok, I dont' need to know how to show the application, I'm just
looking for some way to find out when a document is opened.
Say I have a handle to an application: Dreamweaver, 133080.

I hide it. Then I open a document that uses Dreamweaver.
Is there I way my program could know that a document has been
opened that uses dreamweaver so I can show dreamweaver again?