Library /sys$common/syshlp/nclhelp.hlb enable, mop, circuit, Exception Messages  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 o  unsupported

    Specified function is not supported by this system.

 o  non-existent data link

    Specified data link entity does not exist.

 o  open port failed

    Open port operation failed.