IPC thread, sending messages while processing another message or request is
supported.
-Since the memory sybsystem uses IPC internally, memory allocations and IPC must
+Since the memory subsystem uses IPC internally, memory allocations and IPC must
not be mixed: it is not safe to use IPC inside a memory-related callback, nor is
it safe to allocate/free memory inside IPC callbacks. Attempting to do so may
lead to a deadlock.