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Classes can be marked for operations similar to the standard Emacs commands `M-x tags-search` and `M-x tags-query-replace` (see also See Tags-like Functions.)

`M t`
  Toggle the mark of the line point is in or for as many lines as given by a prefix command. This command can also be found in the class' context menu.

`M a`
  Unmark all classes. With prefix argument `C-u`, mark all classes in the tree. Since this command operates on the whole buffer, it can also be found in the buffer's object menu.

Marked classes are displayed with an `>` in column one of the tree display, like in the following example

         |> Collection
         |    IndexedCollection...
         |>   Set
         |    Dictionary