Library /sys$common/syshlp/patchhelp.hlb REPLACE, Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 location
      Specifies either (1) a single location whose contents are  to  be
      replaced  or  (2) the starting address of a sequence of locations
      whose contents are to be replaced.

 current-contents
      Specifies  one  or  more  data  entries  or  instructions  to  be
      replaced.   The  data  or  instructions  you  specify must be the
      actual contents.

      Do not specify conflicting data types  within  a  single  REPLACE
      command.

 new-contents
      Specifies one or more data entries or instructions  that  are  to
      replace the current contents.

      Do not specify conflicting data types  within  a  single  REPLACE
      command.