Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help peerzombie”.

  PEERZOMBIE starts the low-level peer servicesand switches to zombie
  mode. As a zombie, the peer will not allow any job requests or job results
  to be written to it. It still announces itself to the other peers in the
  network and you can think of this as the "default" or "unspecified" mode.
  Use as
  Optional input arguments should be passed as key-value pairs. The
  following options are available to limit the peer network, i.e. to
  form sub-networks.
    group       = string
    allowuser   = {...}
    allowgroup  = {...}
    allowhost   = {...}
    refuseuser   = {...}
    refusegroup  = {...}
    refusehost   = {...}
  The allow options will prevent peers that do not match the requirements
  to be added to the (dynamic) list of known peers. Consequently, these
  options limit which peers know each other. A master will not send jobs
  to peers that it does not know. A slave will not accept jobs from a peer
  that it does not know.