,------------------------.
                                     |HostSession             |
                                     |------------------------|
,---------------------------------.  |+spawn_removed(): void  |
|These 3 functions are implemented|  |+child_added(): void    |
|---------------------------------|  |+child_removed(): void  |
|                                 |  |+process_crashed(): void|
`---------------------------------'  |+output(): void         |
                                     |+uninjected(): void     |
                                     `------------------------'