** Problem
Almost all of is in these modern days have to (or want to) deal with
more than one application simultaneously. This way, we want to start
some activity in one app, go to another, do something here, and so on.
At some moment a particular application activated previously, finishes
its activity and you want to be aware of this fact to be able to activate
it again and maybe start another activity after all. Luckily X Window
system allows us to do this by mean of EWMH standard implementation.

Namely, application windows expecting rather immediate user action
should indicate this using the urgency bit in the WM_HINTS.flags property,
as defined in the ICCCM.

This contrib extension was written with purpose of providing the
appropriate handles for this low-level xorg functionality to StumpWM.

** Usage
Add this to your =.stumpwmrc=:

Load contrib module:
#+BEGIN_SRC lisp
  (load-module "urgentwindows")
#+END_SRC

Then customize message text, if needed:
#+BEGIN_SRC lisp
  (setf urgentwindows:*urgent-window-message* "application ~a has just finished its business!")
#+END_SRC
Make sure the proper formatting is used (single value placeholder needed, see above), otherwise error occurs.

And finally, use =raise-urgent= to focus urgent windows.