1.2. What's technically possible  GNUstep GUI framework permits
to have basic icons support. More complex GNUstep icons support
is based on the IconKit framework. IconKit handles icons either
vectorial or bitmapped (with size varying from 16*16 to 64*64)
with eight bits alpha channel, and by using antialiasing and
interpolation IconKit is able to scale icons smoothly. IconKit
permits other advanced things like on the fly icons
badging/compositing.  It is advised to use the IconKit
framework, as it will help you creating your icons and managing
them.