IDD Handler
When an application process requests the allocation of IPC resources,
it is the task of the Inter-DIF directory (IDD) to determine what DIF the Allocate
should be delivered to.
This Relay and Mutiplexing part is used by IPC Process in Zero DIF
Note: RMT in 0 DIF and non-0 DIF are different, since in the dif 0 , the underlying is internet.