Difference between delete-window and logout

[Joe Kelsey <joek mail flyingcroc net>]

gnome-terminal behaves differently if I use the "delete-window" button 
on the (window-manager-supplied) title bar and when I use the logout 
button on the Gnome Panel.

Apparantly, this difference in exit path causes the Korn shell to behave 
differently also.  I run ksh93 as my login shell and if I use the 
"delete-window" function to close gnome-terminal before I logout, then 
all of the ksh processes in the tabbed windows die correctly.

If, on the other hand, I leave gnome-terminal running and simply rely on 
the normal gnome-session logout to kill gnome-terminal, then the ksh 
processes do not die, but instead continue to run with ppid set (now) to 
init.

I tried to look at the sources for gnome-terminal for clues, but I do 
not understand the Gnome-gtk-whatever interactions involved.  Can anyone 
shed light on the different paths each exit method takes and why the 
Korn shell might behave differently in each path?

/Joe