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

 The SET TRUNCATE (abbreviated SE TR) command controls the handling of
 long lines in change mode.

 Format: SET [NO]TRUNCATE

 By default, truncate mode is set, which means long lines will be
 truncated on the display (the actual text is not altered).  If you turn
 off truncate mode by using SET NOTRUNCATE, long lines will be wrapped to
 as many screen lines as are necessary to display the entire line.