Inter plugin communication

[Jens Herden]

> after the kdevcore is initialized it's safe to call
> MyInterface::instance().. because all the global-plugins are loaded. Or if
> it's a project-scope plugin you have to wait for the signal
> projectInitialized()

What happens if the plugin 1 was not loaded? Is it still save to call this? 
setInstance() was never executed what will I get from MyInterface 
*instance() ?

Jens