Use the Review Collection dialog box to review a
  collection that you previously selected from an active
  collection view window.

  The dialog box enables you to choose to be a primary
  or read-only reviewer. As a primary reviewer, you are
  able to update benchmarks, a procedure that locks the
  database. As a read-only reviewer, you can display
  the contents of the collection; DTM does not lock the
  database.

  You must choose the Open submenu item before you can
  use the Update submenu item and Display functions.