Library /sys$common/syshlp/edthelp.hlb CHANGE, SUBCOMMANDS, BACK  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 The BACK command sets the cursor direction to backward.  Many nokeypad
 commands use the current direction to determine whether entities to the
 left or to the right of the cursor are to be affected.  When the
 direction is backward, nokeypad commands affect characters to the left
 of the cursor.

 Format: BACK