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

 Applies only to asynchronous DDCMP lines.  Resets a line currently
 being used as a DECnet asynchronous communications line back to a
 terminal line.  The two values of the option are:

   ENABLED    The line is switched to a terminal line after it is
              disconnected from the network (when the channel to the
              network is deassigned).  This is the default for
              dynamic lines.

   DISABLED   The line is not switched to a terminal line.  This is
              the default for static lines.