Library /sys$common/syshlp/dtm$dw_helplib.hlb overview, set_up, history, del_history  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  To delete a specified range of history entries from the
  history, perform the following steps:

  1. Pull down the Maintenance menu.

  2. Choose the Delete menu item and the History...
     submenu item.