On Alpha and Integrity server systems, translates a text name
    of an extension (for example, VMS or NT) into an extension
    identification (EID) that can be used in other persona-related
    system services.

    Format

      SYS$PERSONA_EXTENSION_LOOKUP  extensionName ,extensionID

    C Prototype

      int sys$persona_extension_lookup  (void *extensionName,

                                        unsigned int *extensionID);