[Pharo-users] Send message on pharo open/close?

[David Carlos Manuelda]

I need for my application to register its main class somehow, that pharo 
will send a message (class side) to it whenever image is started/finished, 
for example, to reconfigure database connections as they get invalid when 
image closes and opens again.

Is there any hook for pharo to be able to send a message to my class on 
image open and close?

Thanks.