
[;1m  monitor_node(Node, Flag)[0m

  Monitor the status of the node [;;4mNode[0m. If [;;4mFlag[0m is [;;4mtrue[0m,
  monitoring is turned on. If [;;4mFlag[0m is [;;4mfalse[0m, monitoring is
  turned off.

  Making several calls to [;;4mmonitor_node(Node, true)[0m for the same [;;4m[0m
  [;;4mNode[0m is not an error; it results in as many independent
  monitoring instances.

  If [;;4mNode[0m fails or does not exist, the message [;;4m{nodedown, Node}[0m
  is delivered to the process. If a process has made two calls to [;;4m[0m
  [;;4mmonitor_node(Node, true)[0m and [;;4mNode[0m terminates, two [;;4mnodedown[0m
  messages are delivered to the process. If there is no connection
  to [;;4mNode[0m, an attempt is made to create one. If this fails, a [;;4m[0m
  [;;4mnodedown[0m message is delivered.

  The delivery of the [;;4mnodedown[0m signal is not ordered with respect
  to other link or monitor signals from the node that goes down. If
  you need a guarantee that all signals from the remote node has
  been delivered before the [;;4mnodedown[0m signal is sent, you should
  use [;;4mnet_kernel:monitor_nodes/1[0m.

  Nodes connected through hidden connections can be monitored as any
  other nodes.

  Failure: [;;4mnotalive[0m if the local node is not alive.

[;1m  monitor_node(Node, Flag, Options)[0m

  Behaves as [;;4mmonitor_node/2[0m except that it allows an extra option
  to be specified, namely [;;4mallow_passive_connect[0m.

  This option allows the BIF to wait the normal network connection
  time-out for the monitored node to connect itself, even if it
  cannot be actively connected from this node (that is, it is
  blocked). The state where this can be useful can only be achieved
  by using the Kernel option [;;4mdist_auto_connect once[0m. If that
  option is not used, option [;;4mallow_passive_connect[0m has no effect.

  [;;4mNote[0m

    Option [;;4mallow_passive_connect[0m is used internally and is
    seldom needed in applications where the network topology and
    the Kernel options in effect are known in advance.

  Failure: [;;4mbadarg[0m if the local node is not alive or the option
  list is malformed.
