Creates an instance of a session control transport service
    entity which stores information about modules in the
    Transport layer that support Session Control.

    create  [node node-id] session control -
            transport service transport-name  -
            protocol protocol-id [,tsel hex-string]

    The Protocol argument is required.  It specifies the transport
    protocol to be used by this transport service:

    '04'H      This transport service uses the NSP transport
               protocol.

    '05'H      This transport service uses version 1 of the
               OSI transport protocol.

    The optional TSEL argument is only applicable for the OSI
    transport.

    Examples:

    create session control transport service nsp protocol %X04

    create session control transport service osi protocol %X05

1  –  tsel

    The Transport Selector is used by the OSI Transport Module
    to bind incoming connection requests to session control.
    The default value is the hexadecimal representation of
    "DEC0". This argument is not applicable for NSP transport.

    Example:

    create session control -
            transport service osi protocol %X05, tsel %DEC0

2  –  Exception Messages

 o  already exists

    This session control transport service entity already exists.

 o  duplicate protocol

    The session control transport service entity fails on creation
    because the protocol already exists.

 o  protocol not supported

    The session control transport service entity fails on creation
    because the protocol is not supported by this module.