Creates a TELNET terminal device (TNAx:) and connects to a
    network device (BGx:). If successful, returns the TNA device
    name (TNAx:) in the DCL symbol $TELNET_DEVICE. Network input
    and output operations can then be performed through the created
    TELNET device using terminal driver $QIO operations.

    DCL Format

      BIND_SESSION  network_device [ /PROTOCOL=option ]

1  –  Parameters

 network_device

    Required.

    An existing network device.

2  –  Qualifiers

2.1    /PROTOCOL

       /PROTOCOL=option

    Optional. Default: NONE.

    Options include:

    o  NONE

       Data is sent with no interpretation (raw).

    o  NVT

       Network Virtual Terminal (NVT), TELNET's internal
       representation of a standard network terminal. NVT format
       is standard 7-bit ASCII code transmitted in 8-bit octets, the
       canonical form of data representation used by both the client
       and server.

    o  TELNET

       Standard TELNET protocol.

    o  RLOGIN

       Standard RLOGIN protocol.

3  –  Example

  TELNET> BIND_SESSION BG393: /PROTOCOL=NVT