Library /sys$common/syshlp/ncphelp.hlb SET, LINE, DUPLEX  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Applies to DDCMP lines.  Specifies the hardware duplex mode of the
 line. There are two possible modes:

      HALF    Half-duplex

      FULL    Full-duplex (default)