Capturing title of active window

[dr . tibibo]

Hi folk,
I am trying to figure out the way I can capture a title of the active window 
(i.e. currently focused window) so it'll be available for use in external 
program. For instance, say I running script which sends email if my currently 
active window is named "foo", however it should does nothing if I switch to 
another window named "bar" or switch to another console at all. I was looking 
for kind of screen's appropriate builting variable and seems reached a 
deadlock. So now I need your help.
Please advice, any help is appreciated. 

Thanks and regards,
Artjom.