Creates a Session Control Transport Service entity that stores
    information about modules in the Transport layer that support
    Session Control.

    If the NSP Transport is selected, then the '04'H Protocol ID should
    be selected, and the TSEL field is not applicable.

    If the OSI Transport is selected, then the '05'H Protocol ID should
    be selected, and the TSEL defaults to DEC0, ('DEC0'H).  The Transport
    selector is used by the OSI Transport Module to bind incoming
    connection requests to session control.

    Press the OK button to create the Session Control Transport Service
    entity, or press the CANCEL button to cancel this operation.  In either
    case, you will return to the main window.