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

 Defines  the  maximum  number  of  times any given message (except a
 connect initiate message) will be retransmitted before the logical
 link is disconnected.  The default value is 10.