[Interest] Dynamically change dock icon under OS X

[Bob Hood]

Since OS X doesn't have a "task tray", I'm wondering if there is a way to 
perform some of that functionality by manipulating the dock presence of a 
running application.

For example, I have a Qt application that alters the task tray icon and 
tooltip based on information found in a Python script that it hosts (embedded 
Python).  This works flawlessly using QSystemTrayIcon under Windows, but of 
course, there's no such beast under OS X.  So, I've tried changing the 
application icon (setWindowIcon()) and tooltip (this->setToolTip()), but it 
doesn't have any affect on the presence of the application in the OS X dock.

Anybody have any insights here?  I already suspect it simply isn't possible, 
but I thought I'd ask anyway.