/sys$common/syshlp/NCLHELP.HLB  —  create  session_control, transport_service, 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.
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