text:  inter-process transport passes messages between local processes using a system-dependent IPC mechanism.
  The inter-process transport is currently only implemented on operating systems that provide UNIX domain sockets.
  A 0MQ endpoint is a string consisting of a transport:// followed by an address. The transport specifies the underlying protocol to use. The address specifies the transport-specific address to connect to.
  For the inter-process transport, the transport is ipc, and the meaning of the address part is defined below..
  the endpoint pathname must be writable by the process. When the endpoint starts with /, e.g., ipc:///pathname, this will be an absolute pathname. If the endpoint specifies a directory that does not exist, the bind shall fail.
  on Linux only, when the endpoint pathname starts with @, the abstract namespace shall be used. The abstract namespace is independent of the filesystem and if a process attempts to bind an endpoint already bound by a process, it will fail. See unix(7) for details. m[blue][].