[Qt-interest] signaling to a different QDialog ?

[mpv]

Hi,

I am relatively new to QT and I am using it for a data acquisition project.
My device sends a Windows message when new data is available, and I hook 
this message with QApplication::winEventFilter.
I would like to signal this back to the dialog in the program that started 
the measurement with QT's signal/slot mechanism, but I am having trouble 
getting this to work.
All examples of the connect() call that I have seen handle objects that are 
part of the same QDialog.
Is there an example of e.g. a signal originating from a QApplication object 
connecting to a slot in another QDialog ?
Is this at all possible ?

At present, I use global stuff to handle this situation, which is not very 
elegant.

Regards, Matt